问题描述：
英语语法讲解,急!
1、At that moment,a policeman passed us.(为什么passed可以替换成walked past而不用crossed?)
2、They were worried about their teacher.（为什么were worried about 可以替换成worried about?）
3、Do you know who they are waiting for?(waiting for的for为什么不能去掉?)
4、为什么要用full of?（full的用法是什么?）
5、lend与borrow的区别?
6、you can only look at the thing there.(为什么不用loo而用look at?)
6、you can only look at the thing there.(为什么不用look而用look at？)
1、At that moment,a policeman passed us.(为什么passed可以替换成walked past而不用crossed?)
2、They were worried about their teacher.（为什么were worried about 可以替换成worried about?）
3、Do you know who they are waiting for?(waiting for的for为什么不能去掉?)
4、为什么要用full of?（full的用法是什么?）
5、lend与borrow的区别?
6、you can only look at the thing there.(为什么不用loo而用look at?)
6、you can only look at the thing there.(为什么不用look而用look at？)
问题解答：
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