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in 100 years在100年后
in +时间段,表示“在..之后”.辨析:in 与after
"in+时间段”是指以现在时间为起点的“在一段时间之后”，用在一般将来时态的句子中，对其提问用“how soon”。
“after+时间段”也表示“在（时间）之后”，常用在一般过去时态的句子中;常常指以过去时间为起点的“在一段时间之后”。after后接时间点时,与一般将来时连用。如:
He will come back in ten days.他将在10天后回来。He came back after ten days.他10天后回来了。导练(A）My brother will go there_four o'clock
A in B on C after D for
l think there will be more pollution.
l think后接表否定意义的宾语从句时,应否定前移。如:l don't think he can come.我认为他不会来。导练（C）l don't think he is right,?
A .do I B.don'tl C. is he D. isn't he
