, in “ after +一段时间”在过去时句子中作时间状语, 相当于“一段时间+ later ”“ in+ 一段时间”在将来时句子中作时间状语, 指离说话时多长时间以后。 He returned home after a week(a week later) . They e to visit us ina week. “ after +时间点”可在将来时态的句子中作时间状语;“ in +时间段”表示“在……时间之内”时, 可用于完成时或过去时的句子中。 I will attend a meeting after two o' clock. In the last 10 years , great changes have taken place in this village. (3) 表示时间段的 for , since ①“ for +时间段”意为“多长时间”, 表示动作持续的时间长短, 一般作完成时态或过去时态句子的时间状语。 He has lived in the small village for five years. I studied in Peking University f or4 years. ②“ since +时间点”意为“自从……”, 作完成时态句子的时间状语。 I haven't heard from him since three years ago. He has been waiting here since 2 o'clock. 其他介词(1) 表示交通方式的 by, in, on “ by +名词”表示交通方式时, 名词前不加冠词; 但是 in, on 后的名词必须有冠词或代词等修饰。 He goes to work by car every day. He goes to work in his car every day.
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