c).since +一段时间+ ago.
2)for: for +一段时间= since +一段时间+ ago
9.be made +介词的区别:
be made of 由制成 (看得见原材料)
be made from由制成 (看不见原材料)
be made in +地点 由哪儿生产
be made by sb. 由某人制造
10.表示 数量的介词
about , round around over
1). about , round around表示 大约
2).over 表示 超过= more than.
11.inside / outside
Inside 在里面 ------反义词:outside在.外面
12.in the wall /on the wall
in the wall 表示门窗在墙上 on the wall 表示某东西张贴或挂在墙上
九.不用介词的情况:
1).当时间状为: tonight, today, yesterday, tomorrow 等时,不用介词.
What are you going to do tonight ?
2).含有this, that, these, those, last, next, every, each等时间状语.
He went to Wuhan last week .
3).以all 开头的时间状语前面不用介词.
He has worked all day .
4).以some ,any, one 等构成的时间状语前不用介词.
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