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She has lived in Liverpool all her life.
How clean! Who has cleaned the room?
We have seen the film twice.
Match the reasons for using the present perfect tense
on the right with the sentences.
started in the past and continues to the present
happened in the past and has a connection with the present.
talk about how many times an action has happened till now
一、现在完成时的含义
（1）现在完成时表示过去已经开始，持续到现在,也许还会持续下去的动作或状态。可以和表示延续的时间状语连用。 如for、since 等引导的时间状语。（注意：句中谓语动词要用延续性动词）时间状语的表达方法有两种:
1.Eddie has lived with Millie for 4 years.
2.Eddie has lived with Millie
since he was born.
since 2006
for: + 一段时间 for a year, for two weeks, for three years...
过去的某一时刻, since last week, since 2008…
Since + 一段时间+ago, since 9 years ago, since 3 days ago…,
一般过去时态的时间状语从句：since you came，
since he moved here, since I was born…
since 4 years ago.
Language points
★（一）for＋一段时间
for （two weeks/six months/five days）for短语表示动作延续多长时间 。
He has taught in this school for four years.
（他在这学校教书四年了。）
I haven’t seen her for a long time.
（我好久没有见到她了。）
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