It/This/That is the first time that I’ve seen her.

　　We have been there three times.

　　I have not seen him so far.

　　We have had such bad luck up till now.

　　（4）

　　在句中有in/during/for the past/last +一段时间，常用现在完成时。

　　Great changes have taken place in China in the past twenty years.

　　for+一段时间，常用现在完成时。

　　I have stayed here for seven years.

　　注意： I learned English for four years in that university. Now I am an English teacher in a middle school.

　　recently

　　常用现在完成时

　　I haven’t seen him recently.

　　但：Did she have a party recently?

　　yet (否定，疑问句中)，already(肯定句中)，常用现在完成时。

　　Have you showed him around the museum yet?

　　I’ve already seen that film.

　　It is/has been…since…did

　　It is/has been two weeks since I came here.

　　It is five years since he smoked. 他没有抽烟有5年了。

　　It will be+一段时间+before+subject+do/does…

　　It would be+一段时间+before+subject+did…

　　It was+一段时间+before+subject+did

　　It will be a long time before we meet them again.

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