Day N4 - 12 - Grammar Practice
Complementary Exercises: Daily N4 - Day 12
After reading the original text, practice the grammar points introduced in Day N4-12.
These exercises focus on recognizing mistakes, choosing correct patterns,
and producing your own sentences.
They are divided into three study sessions. Each session focuses on a different way of practicing the grammar introduced in the shadowing practice.
Grammar practiced:
✓ ใฏใใงใ
✓ V［ใ-form］ใจใใใซ〜
✓ V［ใชใ-form］ใชใใฆใใใใงใ
✓ V［ใชใ-form］ใชใใฆใใใพใใพใใ
✓ V［ใชใ-form］ใชใใฆใฏใชใใพใใ
✓ V［dictionary form］ใฎใซ〜
1. Understand
Goal: Recognize and understand how the grammar is used.
Focus on identifying correct patterns and noticing common mistakes.
๐ Find the Error
Identify the sentence that contains a grammar mistake or unnatural usage.
Goal: Train your ability to notice incorrect grammar patterns and avoid common mistakes.
1: Which sentence is grammatically incorrect?
ChoicesC
Correct Sentence: ๆๆฅใฎใคใใณใใซใฏๅๅ ใใชใใฆใใใพใใพใใ。
Explanation: The pattern ～ใชใใฆใใใพใใพใใ means “it is okay not to…” or “you do not have to…”. To form it with a verb, use the negative ใชใ-form, change ใชใ to ใชใใฆ, and add ใใใพใใพใใ: ๅๅ ใใชใ → ๅๅ ใใชใใฆ → ๅๅ ใใชใใฆใใใพใใพใใ.
2: Which sentence is grammatically incorrect?
ChoicesA
Correct Sentence: ใใฎๆฉๆขฐใฏ、ไปๆฅ็ดใใชใใฆใใใพใใพใใ。
Explanation: Time expressions such as ไปๆฅ, ๆๆฅ, and ๆจๆฅ are usually used without the particle ใซ when they indicate when an action happens. Therefore, ไปๆฅ็ดใ is natural, while ไปๆฅใซ็ดใ is generally not used in this meaning. The particle ใซ is more commonly used with specific points in time such as 3ๆใซ, ๆๆๆฅใซ, or 10ๆ5ๆฅใซ.
3: Which sentence is grammatically incorrect?
ChoicesA
Correct Sentence: ๅ ็ใซ่จใใใใจใใใซ、ๅคงๅญฆ้ขใซ็ณใ่พผใฟใพใใ。
Explanation: With the passive verb ่จใใใ (“to be told”), the person who gives the instruction is normally marked with ใซ, so ๅ ็ใซ่จใใใ means “was told by the teacher.” The particle ใ cannot mark the person performing the action in this passive construction.
4: Which sentence is grammatically incorrect?
ChoicesD
Correct Sentence: ้ ใใใจใใฏ、ๆฌ็คพใซ้ป่ฉฑใใชใใฆใฏใชใใพใใ。
Explanation: With ้ป่ฉฑใใ (“to call/telephone”), the person or place being called is normally marked with ใซ, as in ๆฌ็คพใซ้ป่ฉฑใใ. The particle ใ marks a direct object, but ้ป่ฉฑใใ does not take the recipient of the call as a direct object in this construction.
✅ Choice
Choose the best option to complete the sentence.
Goal: Practice selecting the correct grammar form according to the context.
1: ้ป่ฉฑใง่ใใ（ ）、้ง ๅใงในใฟใใใๅพ ใฃใฆใใพใใ。
ChoicesD
Explanation: The pattern verb + ใจใใใซ means “in the way that…” or “just as…,” and is used when an action is performed according to what was heard, seen, explained, instructed, or expected. Here, ่ใใ is a verb in the past form, so it can be followed directly by ใจใใใซ, and ใซ connects the pattern naturally to the following action ๅพ ใฃใฆใใพใใ. With verbs, ใฎ is not inserted before ใจใใ, so ใฎใจใใใซ does not fit here; ใจใใใฎ would need to modify a following noun, and ใจใใใช is not a valid form in this construction.
2: ในใฟใใใไบๅๆใซใฏใคใณใ็จๆใใใฎใง、ใฏใคใณใฏใใใซ（ ）。
ChoicesD
Explanation: The pattern verb + ใฏใใงใ expresses a strong expectation based on some reason or evidence, meaning “should” or “is expected to.” Since ใใ is a verb, it connects directly to ใฏใใงใ in its plain form: ใใใฏใใงใ.
3: ในใฑใธใฅใผใซใซ「ใคใใณใใฏๅๆใใ」ใจๆธใใฆใใใฎใง、ใคใใณใใฏๅๆใใ（ ）。
ChoicesA
Explanation: The pattern ～ใฏใใงใ expresses an expectation based on reliable information or evidence. When ใฏใ follows a phrase ending in a particle such as ใใ, ใฎ is commonly used to connect that phrase to ใฏใ, giving ๅๆใใใฎใฏใใงใ, “it should be from ten o’clock.”.
4: ในใฟใใ：ใใฎ่ท็ฉใฏ、ๅฎถใซๆใฃใฆๅธฐใฃใฆใไบๅๆใซ็ฝฎใใฆใใใใงใ。ไปๆฅใฏๅฎถใซ（ ）。
ChoicesA
Explanation: ～ใชใใฆใใใพใใพใใ means “it is okay not to…” and is used to say that an action is optional. Since the speaker has already said that either taking the package home or leaving it at the office is acceptable, saying ๆใฃใฆๅธฐใใชใใฆใใใพใใพใใ matches that meaning exactly.
✏️ Correct
Find and fix the grammar mistake in the sentence.
Goal: Practice applying grammar rules and producing accurate Japanese sentences.
1: ใใชใใใใฃใฑใใชใ、ใขใคในใฏไปใใ้ฃในใชใใฆใใใพใใพใใ。
ใใชใใใใฃใฑใใชใ、ใขใคในใฏไปใใ้ฃในใชใใฆใใใพใใพใใ。
Explanation: To say that it is okay not to do something, use the pattern verb + ใชใใฆใใใพใใพใใ. For an ichidan verb like ้ฃในใ, change ใ to ใชใใฆ, giving ้ฃในใชใใฆใใใพใใพใใ.
2: ใใฎ็ฎฑใฏ、ๆใ้ใณใฎใซไฝฟใใพใ。
ใใฎ็ฎฑใฏ、ๆใ้ใถใฎใซไฝฟใใพใ。
Explanation: When ใฎใซ expresses purpose, as in “used for doing something,” the verb before it must be in the dictionary form.
3: ๆฐๅใๆชใๆฅใฏ、ใคใใณใใซๅๅ ใใชใใฆใใใพใใพใใ。
ๆฐๅใๆชใๆฅใฏ、ใคใใณใใซๅๅ ใใชใใฆใใใพใใพใใ。
Explanation: To say that it is okay not to do something, use ～ใชใใฆใใใพใใพใใ. With ๅๅ ใใ, the negative form used in this pattern is ๅๅ ใใชใใฆ, so it becomes ๅๅ ใใชใใฆใใใพใใพใใ.
2. Practice
Goal: Practice using the grammar in different situations.
Apply the grammar by correcting, transforming, and creating sentences.
๐ Find the Error
Identify the sentence that contains a grammar mistake or unnatural usage.
Goal: Train your ability to notice incorrect grammar patterns and avoid common mistakes.
1: Which sentence is grammatically incorrect?
ChoicesA
Correct Sentence: ใใฎใคใใณใใงใฏ、ในใผใใ็ใชใใฆใใใใงใ。
Explanation: The pattern ～ใชใใฆใใใ means “do not have to…” or “it is okay not to…”. Since ใใ is an ใ-adjective, it cannot be followed directly by ใ ; in polite speech, use ใใใงใ, while in plain speech simply use ใใ.
2: Which sentence is grammatically incorrect?
ChoicesD
Correct Sentence: ใใฎ้ง ใฏใใใใ่ฟใใฏใใงใ。
Explanation: The expression ～ใฏใใงใ means “is expected to…” or “should be…”. With ใ-adjectives, it attaches directly to the adjective, as in ่ฟใใฏใใงใ. The particle-like connector ใช is used with ใช-adjectives before ใฏใ, such as ้ใใชใฏใใงใ, but it cannot be added after an ใ-adjective like ่ฟใ.
3: Which sentence is grammatically incorrect?
ChoicesD
Correct Sentence: ใใฎ็ฎฑใฏ、ไปๆฅ้ใฐใชใใฆใใใพใใพใใ。
Explanation: The pattern ～ใชใใฆใใใพใใพใใ means “it is okay not to…” or “you do not have to…”. To use it with ้ใถ, first form the negative ใชใ-form: ้ใถ → ้ใฐใชใ, then change ใชใ to ใชใใฆ and add ใใใพใใพใใ, giving ้ใฐใชใใฆใใใพใใพใใ.
4: Which sentence is grammatically incorrect?
ChoicesB
Correct Sentence: ๆๆฅใฎ่ฆๅญฆใซใฏ่กใใชใใฆใใใใงใ。
Explanation: The pattern ～ใชใใฆใใใใงใ means “do not have to…” or “it is okay not to…”. To form it, take the verb’s negative ใชใ-form and change ใชใ to ใชใใฆ before adding ใใใใงใ.
5: Which sentence is grammatically incorrect?
ChoicesC
Correct Sentence: ใใฎๆฉๆขฐใฏๆฌๆฅไธญใซไฟฎ็ใใชใใฆใฏใชใใพใใ。
Explanation: The pattern ～ใชใใฆใฏใชใใพใใ means “must” or “have to” and is already a polite expression because ใชใใพใใ is the polite negative form of ใชใ. Therefore, adding ใงใ after it as ใชใใพใใใงใ is not standard Japanese.
✏️ Correct
Find and fix the grammar mistake in the sentence.
Goal: Practice applying grammar rules and producing accurate Japanese sentences.
1: ๆๆฅใพใงใซ็ณ่พผๆธใๆธใใชใใฆใฏใชใใพใใ。
ๆๆฅใพใงใซ็ณ่พผๆธใๆธใใชใใฆใฏใชใใพใใ。
Explanation: To express obligation with ～ใชใใฆใฏใชใใพใใ, the verb must be changed to its negative ～ใชใใฆ form. For ๆธใ, this becomes ๆธใใชใใฆ, so the correct structure is ๆธใใชใใฆใฏใชใใพใใ.
2: ใใฃใ็งใ่จใใใจใใใซ、ใฏใคใณใไบๅๆใธ้ใใงใใ ใใ。
ใใฃใ็งใ่จใฃใใจใใใซ、ใฏใคใณใไบๅๆใธ้ใใงใใ ใใ。
Explanation: When ใจใใใซ means “in the way that” or “as,” a verb referring to a completed action can be used in the plain past form. Since the speaker is referring to something they said earlier, ่จใ becomes ่จใฃใ, giving ่จใฃใใจใใใซ.
3: ๆฏๆฅๅพฉ็ฟใใใชใฎใซ、ใใๅฟใใฆใใพใใพใ。
ๆฏๆฅๅพฉ็ฟใใใฎใซ、ใใๅฟใใฆใใพใใพใ。
Explanation: When ใฎใซ means “although” or “even though,” it follows verbs directly in their plain form, so ๅพฉ็ฟใใใฎใซ is correct. ใชใฎใซ is used after nouns and na-adjectives, not after verbs.
4: ไปๆฅใฏๆใใใฎใง、ๆๆฟใๅ ฅใใชใใฆใใใใงใ。
ไปๆฅใฏๆใใใฎใง、ๆๆฟใๅ ฅใใชใใฆใใใใงใ。
Explanation: To say that it is not necessary to do something, use ～ใชใใฆใใใใงใ. With ๅ ฅใใ, the negative form used in this pattern is ๅ ฅใใชใใฆ, so it becomes ๅ ฅใใชใใฆใใใใงใ.
5: ใใฎๆฉๆขฐใฏ、ใคใใณใใฎๅใซไฟฎ็ใใชใใงใฏใชใใพใใ。
ใใฎๆฉๆขฐใฏ、ใคใใณใใฎๅใซไฟฎ็ใใชใใฆใฏใชใใพใใ。
Explanation: To express obligation with ～ใชใใฆใฏใชใใพใใ, the negative verb form must be followed by ใฆใฏ, so ไฟฎ็ใใ becomes ไฟฎ็ใใชใใฆใฏใชใใพใใ.
✏️ Rewrite
Rewrite the sentence using the given grammar pattern.
Goal: Practice expressing the same idea using different grammar structures.
1: ใใคใๅฐๅณใง่ชฟในใพใใ、้ใซ่ฟทใใพใ。
ใใคใๅฐๅณใง่ชฟในใใฎใซ、้ใซ่ฟทใใพใ。
Explanation: Here, ใฎใซ expresses an unexpected or contrasting result, similar to “even though” or “despite the fact that.” Compared with ใ, which simply connects two contrasting ideas, ใฎใซ more strongly suggests that the second situation is surprising or contrary to what would normally be expected. Since checking a map should usually prevent someone from getting lost, ใฎใซ naturally emphasizes this contradiction.
2: ๆฏๆฅๅพฉ็ฟใใพใใ、ใใๅฟใใฆใใพใใพใ。
ๆฏๆฅๅพฉ็ฟใใใฎใซ、ใใๅฟใใฆใใพใใพใ。
Explanation: Here, ใฎใซ highlights the contrast between making the effort to review every day and still forgetting things quickly. Compared with ใ, which presents a more neutral contrast, ใฎใซ adds a stronger sense that the result is unexpected or disappointing. Because regular review would normally help someone remember, using ใฎใซ makes the contradiction between the effort and the outcome more noticeable.
3: ใคใใณใใฎๅใซๆฌ็คพใธ้ฃ็ตกใใชใใฆใฏใใใพใใ。
ใคใใณใใฎๅใซๆฌ็คพใธ้ฃ็ตกใใชใใฆใฏใชใใพใใ。
Explanation: ใชใใฆใฏใชใใพใใ expresses a strong obligation or necessity and is a more formal version of ใชใใฆใฏใใใพใใ. Both patterns mean that something “must” or “has to” be done, but ใชใใฆใฏใชใใพใใ tends to sound slightly more formal and is especially appropriate in professional, official, or written contexts.
4: ใใฃใๆบใฎไธใใกใใใจๆขใใใฎใง、่ฒกๅธใฏใใใซใฏใชใใงใใใ。
ใใฃใๆบใฎไธใใกใใใจๆขใใใฎใง、่ฒกๅธใฏใใใซใฏใชใใฏใใงใ。
Explanation: ใฏใใงใ expresses a conclusion based on evidence, knowledge, or a reasonable expectation. Compared with ใงใใใ, which often sounds like a softer prediction or guess, ใฏใใงใ shows stronger confidence because the speaker has a clear reason for the conclusion. In this case, having already searched the area carefully provides the evidence for believing that the wallet is not there.
5: ๆฏๆฅๆฉใๅฏใพใใ、ใใๅฏๅใใพใ。
ๆฏๆฅๆฉใๅฏใใฎใซ、ใใๅฏๅใใพใ。
Explanation: Here, ใฎใซ emphasizes that the result is contrary to what would normally be expected. Going to bed early should usually make it easier to wake up on time, so ใใๅฏๅใใพใ feels surprising in contrast. Compared with ใ, which simply connects two contrasting facts, ใฎใซ more clearly conveys the speaker’s sense that the outcome is unexpected.
3. Review
Goal: Review and reinforce the grammar you learned.
Combine different exercise types to check your understanding and build confidence.
๐ Find the Error
Identify the sentence that contains a grammar mistake or unnatural usage.
Goal: Train your ability to notice incorrect grammar patterns and avoid common mistakes.
1: Which sentence is grammatically incorrect?
ChoicesA
Correct Sentence: ๆๆฅ็ใๆใๆดใใชใใฆใฏใชใใพใใ。
Explanation: The pattern ～ใชใใฆใฏใชใใพใใ means “must” or “have to.” To use it with ๆดใ, first form the negative ใชใ-form: ๆดใ → ๆดใใชใ, then change ใชใ to ใชใใฆ and add ใฏใชใใพใใ, giving ๆดใใชใใฆใฏใชใใพใใ.
2: Which sentence is grammatically incorrect?
ChoicesB
Correct Sentence: ไธ็ใฏ่ชๅใง็จๆใใชใใฆใใใใงใ。
Explanation: ็จๆใใ is a ใใ-verb, so its negative form is ็จๆใใชใ, not ็จๆใชใ.
3: Which sentence is grammatically incorrect?
ChoicesB
Correct Sentence: ใใฎในใผใใฏๆฐใใใฏใใงใ。
Explanation: The expression ～ใฏใใงใ means “should be…” or “is expected to be…”. With ใ-adjectives, ใฏใ attaches directly to the adjective, so ๆฐใใใฏใใงใ is correct.
4: Which sentence is grammatically incorrect?
ChoicesA
Correct Sentence: ในใฟใใใๆธใใใจใใใซ、็ณ่พผๆธใๆธใใฆใใ ใใ。
Explanation: The pattern ～ใจใใใซ means “as…” or “in the way that…”. When referring to an action that has already been completed, the verb normally appears in the plain past form before ใจใใใซ, so ๆธใ → ๆธใใใจใใใซ means “as [someone] wrote.”.
✅ Choice
Choose the best option to complete the sentence.
Goal: Practice selecting the correct grammar form according to the context.
1: ๆจๆฅใใฎๆฉๆขฐใไฟฎ็ใใใฎใง、ไปๆฅใฏๆฎ้ใซ（ ）。
ChoicesD
Explanation: The pattern verb + ใฏใใงใ is used to express a strong expectation based on a reason or evidence. Since the machine was repaired yesterday, the speaker reasonably expects it to work normally today, so the dictionary form ๅใ connects directly to ใฏใใงใ.
2: ็ณ่พผๆธใฏไปๆฅใพใงใงใใใ、ๆฌๆฅไธญใซ（ ）。
ChoicesB
Explanation: ～ใชใใฆใฏใชใใพใใ means “must” or “have to” and expresses necessity or obligation. Because the application form is due today, it needs to be submitted by the end of the day, so ๅบใใชใใฆใฏใชใใพใใ fits the context.
3: ในใฟใใใฏใฟใใชใใไบๅๆใซๆฅใฆใใพใใใ、้ ใใฆใใไบบใฏ（ ）。
ChoicesC
Explanation: The pattern verb + ใฏใใงใ expresses a strong expectation based on known information. Since all the staff members have already arrived at the office, the speaker concludes that there should be no one who is late, so the negative plain form ใใชใ connects directly to ใฏใใงใ.
4: ้ๅๆ้ใซ้ ใใใจใใฏ、ในใฟใใใซ（ ）。
ChoicesA
Explanation: ～ใชใใฆใฏใชใใพใใ means “must” or “have to” and is used to express an obligation. In this situation, if someone is going to be late for the meeting time, contacting the staff is presented as something required, so ้ฃ็ตกใใชใใฆใฏใชใใพใใ fits naturally.
✏️ Correct
Find and fix the grammar mistake in the sentence.
Goal: Practice applying grammar rules and producing accurate Japanese sentences.
1: ในใฟใใใฏๅๆใพใงใซ้ๅใใชใใใฆใฏใชใใพใใ。
ในใฟใใใฏๅๆใพใงใซ้ๅใใชใใฆใฏใชใใพใใ。
Explanation: To express obligation with ～ใชใใฆใฏใชใใพใใ, the negative ending ใชใ changes to ใชใใฆ before ใฏใชใใพใใ.
2: ไธ็ใใใใใๆใฃใฆใใใฎใง、ๆฏๆฅๆดใใชใใงใใใพใใพใใ。
ไธ็ใใใใใๆใฃใฆใใใฎใง、ๆฏๆฅๆดใใชใใฆใใใพใใพใใ。
Explanation: To say that it is okay not to do something, use ～ใชใใฆใใใพใใพใใ. With ๆดใ, the negative form becomes ๆดใใชใใฆ, followed by ใ, giving ๆดใใชใใฆใใใพใใพใใ.
3: ๆผไผใฟใฏ、ไบๅๆใธ่กใใชใใใฆใใใพใใพใใ。
ๆผไผใฟใฏ、ไบๅๆใธ่กใใชใใฆใใใพใใพใใ。
Explanation: To say that it is okay not to do something, use ～ใชใใฆใใใพใใพใใ. With ่กใ, the negative form ่กใใชใ changes to ่กใใชใใฆ before ใ, giving ่กใใชใใฆใใใพใใพใใ.
✏️ Rewrite
Rewrite the sentence using the given grammar pattern.
Goal: Practice expressing the same idea using different grammar structures.
1: ็ณ่พผๆธใซ้ป่ฉฑ็ชๅทใๆธใใชใใฆใใใใงใ。
็ณ่พผๆธใซ้ป่ฉฑ็ชๅทใๆธใใชใใฆใใใพใใพใใ。
Explanation: ใชใใฆใใใพใใพใใ means that doing something is not necessary and that it is acceptable not to do it. Compared with ใชใใฆใใใใงใ, which is very common and neutral in everyday speech, ใชใใฆใใใพใใพใใ sounds slightly more formal and explicitly emphasizes that there is no problem if the action is omitted.
2: ใฏใคใณใฏ็จๆใใชใใฆใใใพใใพใใ。
ใฏใคใณใฏ็จๆใใชใใฆใใใใงใ。
Explanation: ใชใใฆใใใใงใ expresses that something is not necessary or required. Compared with ใชใใฆใใใพใใพใใ, which can sound slightly more formal and emphasizes that there is no problem if the action is not done, ใชใใฆใใใใงใ is more common and conversational, making it especially natural in everyday situations.
3: ในใฟใใใ่ฆใใฆใใใใใใซ、ใใฎๆฉๆขฐใๅใใใพใใ。
ในใฟใใใ่ฆใใฆใใใใจใใใซ、ใใฎๆฉๆขฐใๅใใใพใใ。
Explanation: ใจใใใซ means doing something exactly in the same way as a model, instruction, or previous example. Compared with ใใใซ, which can describe following a general manner or example, ใจใใใซ more strongly emphasizes matching what was shown or instructed. Here, it indicates that the machine was operated in the same way the staff member demonstrated.
๐ฌ Complete the Dialogue
Fill in the blank to complete the conversation using the proposed grammar pattern.
Goal: Practice applying specific grammar structures to construct natural responses in realistic conversation contexts.
Question 1:
A：ใใฎๆใฏ、ใฉใใใฃใฆ็ใใใงใใ。
B：ใพใ、ใใใซ่
ใ้ใใฆ、ๆฌกใซใใใ้ใใพใ。ใใใงใ。ๅใใใพใใใ。
A：＿＿＿＿＿＿＿＿＿＿＿＿。
ใฏใ。ไปๆใใฆใใใฃใใจใใใซ็ใฆใฟใพใ。
Explanation: The Suggested Answer 「ไปๆใใฆใใใฃใใจใใใซ」 fits naturally because A has just watched and listened to B explain how to put on the clothing and now intends to follow those instructions. The pattern V[ใ-form] + ใจใใใซ means “in the same way as / exactly as” something was done, explained, or instructed, so ๆใใฆใใใฃใใจใใใซ expresses that A will follow the method B has just shown. Using ็ใฆใฟใพใ also works well here because 〜ใฆใฟใ indicates trying something, making the response a natural continuation after B asks whether A understood.
Question 2:
A：ใคใใณใใซๅๅ ใใใใใงใใ、ในใผใใๆใฃใฆใใพใใ。
B：＿＿＿＿＿＿＿＿＿＿＿＿。
ๆ่ฃ ใฏ่ช็ฑใงใใใ、ในใผใใ็ใชใใฆใใใพใใพใใ。
Explanation: The Suggested Answer 「ในใผใใ็ใชใใฆใใใพใใพใใ」 fits naturally because A is worried that not owning a suit might prevent them from joining the event. The pattern V[ใชใ-form] + ใชใใฆใใใพใใพใใ means that it is acceptable or not a problem if someone does not do something, so it reassures A that wearing a suit is not required. The added reason ๆ่ฃ ใฏ่ช็ฑใงใใใ makes the response even more natural by explaining why a suit is unnecessary.
Question 3:
A：ใคใใณใใฏไฝๆใใใงใใ。
B：ๅๆใใใงใ。ในใฑใธใฅใผใซใซใฏ、ในใฟใใใฏไนๆๅใซ้ใพใใจๆธใใฆใใใพใ。
A：ใใไนๆๅๅไบๅใงใใญ。
B：＿＿＿＿＿＿＿＿＿＿＿＿。
ใฏใ、ในใฟใใใฏใใๆฅใฆใใใฏใใงใ。
Explanation: The Suggested Answer 「ในใฟใใใฏใใๆฅใฆใใใฏใใงใ」 fits naturally because the schedule says the staff are supposed to gather at 9:30, and it is already 9:45. The pattern ใฏใใงใ is used when the speaker makes a confident expectation based on known information or evidence, so B reasonably concludes that the staff should already be there. The form ๆฅใฆใใ is especially appropriate because it describes the expected current state resulting from their arrival.
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