We've been living here for ten years.

We've lived here for ten years.

我们在这儿已经住了十年了。

b．在不和时间状语的情况下，现在完成进行时表示动作仍在进行。而现在完成时则表示动作在过去已结束。例如：

The students have been preparing for the exam.(还在进行)学生们一直在准备考试。

The students have prepared for the exam.（已经结束）学生们为考试作了准备。

c．有些表示状态、感情、感觉的动词如：have, exist, like, hate, hear, know, sound等动词不能用于现在完成进行时，但可用于现在完成时。例如：

They've known each other since 1970.自从1970年起他们就相互认识了。

StepII 当堂检测

Finish the Activity 1、2、3 and 4 on Page 46、47 in the textbook.

StepIII 语法聚焦自测：

1. - I'm sure Andrew will win the first prize in the final.

- I think so. He ________ for it for months.

A. is preparing B. was preparing C. had been preparing D. has been preparing

2. By the time he realizes he _______into a trap, it'll be too late for him to do anything about it

A. walks B. walked C. has walked D. had walked

3. So far this year we ____ a fall in house prices by between 5 and 10 percent

A. saw B. see C. had seen D. have seen

4. Cathy is taking notes of the grammatical rules in class at Sunshine School, where she ______ English for a year.

A. studies B. studied C. is studying D. has been studying

5. Danny _________ hard for long to realize his dream and now he is popular.

A. works B. is working C. has worked D. had worked

6．--I have got a headache.

-No wonder. You ________ in front of that computer too long.

A．work B．are working C．have been working D．worked

7．Experts have been warning ________ of the health risks caused by passive smoking.

A．at a time B．at one time C．for some time D．for the time