英语六级语法复习汇编（1）

>>英语六级学习技巧：英语六级语法复习汇编（1）

>>英语六级备考辅导课程

since的四种用法

1) since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six)。

I have been here since 1989.

2) since +一段时间+ ago

I have been here since five months ago.

3) since +从句

Great changes have taken place since you left.

Considerable time has elapsed since we have been here.

4) It is +一段时间+ since从句

It is two years since I became a postgraduate student.

cease doing/to do的区别

cease to do长时间，甚至永远停做某事。

cease doing短时停止做某事，以后还会接着做。

That department has ceased to exist forever.

那个部门已不复存在。

The girls ceased chatting for a moment when their teacher passed by.

姑娘们在老师走过时，停了会聊天。

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