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B:Since …
B:How long have you known your best friend?
A:For …
B: How long have you …?
A: For/ Since…
What about you?
1. I haven’t done much exercise since I got my computer last year.
2. I have had him for three months now.
3. Since then, it has become part of my life.
4. I’ve been ill for about three days!
5. We have played football for a year now.
6. Scientists think that there has been life on the earth for hundreds of millions of years.
现在完成时可以表示某一行为或某一状态从过去某一时间一直持续到现在。这类句子通常包含由for或since引导的时间状语， ， 。如：
I have lived in Beijing for 10 years.
我在北京住了10年了。
I have been in this school since 2000.
从2000年起我就一直在这所学校。
for后接一段时间
since后接时间点
I have lived in Beijing for 10 years.
I stayed in the hotel for a week last summer.
I have stayed in the hotel for a week now.
I will stay in the hotel for a week next month.
表示某一行为或状态持续多长时间时，根据时间的不同，可以使用不同的时态。
用how long对现在完成时的时间状语提问。
How long have you lived in Beijing?
I have lived in Hebei _____ ten years.
He has been in this school ______2000.
My father has worked there ______ 4 years.
She has waited for you ______ 2 pm.