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过去发生的事对现在有影响;过去发生的事一直持续到现在,并有可能继续持续下去。
have/has+过去分词
同定义
He has already finished his homework. He has lived in Beijing for ten years.
ever, just, yet, already, ever since, so far, recently, for+时间段,since+时间点
一、当句中有for+时间段,since+时间点,how long 时,
要求:have(has) + 过去分词(动词须是持续性动词)非持续性动词不能直接和for 或since 连用,但我们可以找一个相应的持续性动词或动词短语来替换这些非持续性动词。
leave-- be away, borrow-- keep, begin/start-- be on, die-- be dead, move to--live in,
finish-- be over, join in-- be in, buy– have.
He has kept the book for two weeks.
The movie has been on for ten minutes.
二、have/has been to, have/has gone to, have/has been in区别
have/has been to 意为“去过.....地方”(已回来)
have/has gone to 意为“去......地方了”(还没回来)
have/has been in 意为“在某地待了多久”