立彬の日本語

彼が在宅しているかどうか確かめなくてはならない。

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I must make sure whether he is at home or not.
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在宅， ざいたく
1. being at home, being in
在家，呆在家里
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かどうか
1. whether or not (in phrases like "I don't know whether or not I can come")
是否、能否(在诸如“我不知道自己是否能来”这样的表述中)
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確かめる， 慥かめる， たしかめる
1. to make sure, to check, to ascertain, to confirm, to verify
确保、进行检查、查明、确认、核实
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なくてはならない， 無くてはならない
1. cannot do without something, indispensable, absolutely necessary 2. have to do
必不可少，绝对必要；必须
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彼(かれ)
彼， かれ
1. he, him 2. boyfriend
他
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が
が
1. indicates the subject of a sentence 2. indicates possession 3. but, however, (and) yet, though, although, while 4. and 5. used after an introductory remark or explanation 6. regardless of ..., whether ... (or not), no matter ... 7. indicates a des...
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為る(する){している}
する， 為る
1. to do, to carry out, to perform 2. to cause to become, to make (into), to turn (into) 3. to serve as, to act as, to work as 4. to wear (clothes, a facial expression, etc.) 5. to judge as being, to view as being, to think of as, to treat as, to use...
做，作，干，执行
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