You use 'I' in a sentence when you are telling someone about yourself or when you are giving your opinion about something.
E.g. 1)I don't like ice-cream.(about yourself)
2)I don't think you should do that.(your opinion about something)
You use 'me' in sentences like "This matter doesn't concern me" etc.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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Use it in a big sentence.
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