文档介绍：Police in America have stepped up their search for a boy who went missing.
2. People have shown great interest in his
o years .
has been missing for two weeks.
6. I haven’t seen Guo Yi these days.
Extension 2
have studied
have lived
has been dead
Summary 2：
强调某一动作或状态从过去某一时间开始延续到现在且有可能继续下去用延续动词。通常和for, since. so far, by now, until now, these days, in the last ten years,引导的时间状语连用。
Drill 2
price _____recently, but I doubt whether it will remain so.
A went down, B will go down
C has gone down D was going down
2. In the past few years there ____ great changes in Da Miao town.
A is B were C have been D will be.
Time friends
1. 迄今为止：so far, up till now, up to now, until now….
：in the last/past years, recently, lately, these few days….
：all day, all this year, all one’s life
瞬间性动词如 arrive, join , die, get , come, buy, sell, leave, borrow, marry 等，以及终止性动词如start, begin, finish等，在现在完成时的肯定形式中不能与 “for + 一段时间”的时间状语连用，但可以用在否定句或这些动词对应的状态动词中。为了表述这种意思，我们常用相应的延续性动词have,keep,be..等来代替非延续性动词。
Tips :
Choose the right answers
1. I have joined/been in the army for ten year.
2. He has been to /gone to Dalian many times.
3. She has got married/been married to Roberts for a year.
4. All the preparations for the task are completed/ have been completed ,and we’re ready to start.
5. He has gone/ been away for two days.
6. He has had/ has bought this book for a year.
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现在完成时与一般过去时的用法比较
现在完成时属于现在时态范围，因此，不能和 yesterday, last night, two weeks ago等表示过去的时间状语连用。
The plane has arrived . （说明现在的情况：飞机在这儿）
The plane arrived a quarter ago. （动作发生在过去与现在无关）
I have taught here for fifteen years. （表示十五年前的动作一直延续到现在，还可能会继续。）
I taught here for a year. （曾在这儿教过，但现在不在这儿任教了）
Comparasion
Put the following sentences into English.
A: 火车已经开走了.
B: 什么时候开走的?
A: 半个小时之前开走的.
A: 这本书我已经买了两年了.
B: 你在哪儿买的?
A: 在我老家买的.
A: 你看过这部电影吗?
B: 看过.
A: 什么时候看的.
B: 上周星期天看的.
A: The train has left.
B: When