Period Three　Grammar & Writing

单元语法--现在完成时

Ⅰ.用所给动词的正确形式填空

1．It has been/is(be) six years since we last saw each other.

2．You know，I have seen(see) quite a lot of China and I have visited some beautiful cities.

3．They have just completed(complete) the huge apartment block!

4．They have put(put) up a lot of high-rise buildings recently.

5．Our earth has been polluted(pollute) heavily so far.

Ⅱ.句型转换

1．I have been to Macau before.(改为否定句)

I have not been to Macau before.

2．We began to learn English three years ago.(改为同义句)

We have learned English for three years.

3．Mr Li began to teach English in this school in 1999.(改为同义句)

Mr Li has taught English in this school since 1999.

4．His company was closed in 2003.(改为同义句)

His company has been closed since 2003.

　　现在完成时表示到目前为止已经完成的动作或存在的状态，它强调的是结果，而不是动作。

　　现在完成时的构成为：have/has＋过去分词。

　　一、现在完成时的用法

　　1．表示过去发生或已经完成的某一动作对现在造成的影响或结果。可以表示最近完成的动作，也可以表示经历或经验。常与just，recently，so far，up to now，till now，ever，never等连用。

　　I have already finished all the work.

　　我已经完成了所有的工作。

Mr Smith has just left.