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どうしたの

1. what's the matter?, what's wrong? 2. what happened (to) ...?, what have you done (with) ...?, where is ...?

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顔色が悪い， 顔色がわるい， かおいろがわるい

1. looking pale, looking unwell

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どうかした

1. is something wrong?, what's wrong?, what's the matter? 2. slightest, mere, trivial, some, chance, accidental, unexpected

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のです， んです

1. the expectation is that ..., the reason is that ..., the fact is that ..., the explanation is that ..., it is that ...

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です

1. be, is

断定助动词，是，是也

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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...

tbd

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