2.since / for表时间时的区别: since后接表示起点时间的词; for后接表示段时间的词
a. I have been living here since 1972.
b. I have lived here for 32 years.
3.in / after在表示在(一段时间)之后时, in常与将来时连用; after常与过去时连用
a. The doctor will be here in ten minutes.
b. He said he would be back in a few days.
c. He came back after two hours.
4.表示在某街道时, 其前有门牌号时, 介词用at; 不标明门牌号时, 英国英语用in, 美国英语用on
a. My uncle lives at 105 Beijing street.
b. She lives in / on Wuyi Street.
5.表示 穿过时, across表示动作在表面或近似表面上进行, through表示动作在空间里进行
a. The old man came across the street himself.
b. They went through the forest three days later.
6.表示相对方位时, in表示在内部, to表示在外部, on表示接壤
a. Japan is to the east of China.
b. The Pacific is on the east of China.
c. Shanghai is in the east of China.
7.表示 在上, 在下时, on / beneath表示与表面接触, over / under表示不与表面接触, 垂直在上或在下, above / below表示不与表面接触, 在上或在下, 不一定垂直
a. The boy is standing on the table.
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