来源:沈阳美联英语培训学校
时间:2019/10/14 12:56:50
现在完成时可以表示过去发生或已经完成的某一动作对现在造成的影响或结果.常与just,already,ever,before等连用;或者表示过去已经开始,一直延续到现在的动作或状态,常与for,since连用。
用法一:表示过去发生或已经完成的某一动作对现在造成的影响或结果.常与just(刚刚),already(已经),never(从来没有),ever(曾经),before(以前),yet(仍然),
once(一次),twice(两次),many times(很多次),how many times(多少次),so far(迄今为止),during the past(last)three years(近三年来)等连用.
※副词的位置:①just常用于肯定句中,放在have/has后,He has just come.
②never表示否定,放在have/has后,He has never visited the Great Wall.
③ever用于疑问句中,句型为:Have/Has+主语+ever+过去分词?“…曾经……过吗?”用于询问某人过去的经历.Have you ever been to the farm?
④before用于句末,The woman has never heard of that before.
⑤yet用于句末或not之后.Has the train arrived yet?No,not yet.
⑥already用于肯定句,have/has之后或句末.We have already finished it.
⑦so far用于句首或句末.So far,we have visited the moon.
用法二:表示过去已经开始,一直延续到现在的动作或状态.时间状语有:
①for+表示一段时间的词语I have taught English for 19 years.
②since+表示过去时间点的词语He has been at this school since 1986.
③since+表示过去的时间状语从句I have lived here since I was born.
④since+一段时间+ago.I have known him since 20 years ago.
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