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例如：
He will come back in two hours.他两小时后就回来。
He came back after two hours.两个小时后他回来了。
They will visit their teacher after Friday .星期五以后他们去看望老师。
(4)by+过去时间点(表示到……为止，主句时态用过去完成时)
例如：
We had learned fifty lessons by the end of last term.
4、表示地点、范围、趋向的介词。
(1)at+点、on+面、in+体
例如：
A stranger stood at the door with a picture on it, looking in through a hole in the door.
(2)across+表面，through+空间
例如：
The river runs through our city, across the fields and then into the sea.
(3)in+大地方，at+小地方
例如：
He arrived at the village(或in Shanghai)yesterday.
(4)to the+方位词+of+不接壤的地区。
On the +方位词+of+接壤的地区。
In the +方位词+of+其中的大地区
例如：
Japan is to the east of China.日本在中国以东。
The pacific is on the east of China.太平洋在中国的东面。
Shanghai is in the east of China.上海在中国的东面(内部)。
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