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ı have read a book and heard of it a lot.someone is talking and says"could not sleep last night" or "just preparing" sentences like that can we always do this or just only while speaking

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You can do it, but it's casual in the example you cited. Imperative sentences usually have an implied subject, but answers to questions could as well. If someone asked where I was born, I wouldn't say or write "I was born in America." I would respond simply "America." It's arguable about whether this is a true sentence, but I would side on it being a sentence with an implied subject and verb.

Talmage
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