現(xiàn)在完成時可以表示過去發(fā)生或已經(jīng)完成的某一動作對現(xiàn)在造成的影響或結(jié)果.常與just，already，ever，before等連用；或者表示過去已經(jīng)開始,一直延續(xù)到現(xiàn)在的動作或狀態(tài)，常與for，since連用。

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用法一：表示過去發(fā)生或已經(jīng)完成的某一動作對現(xiàn)在造成的影響或結(jié)果.常與just（剛剛）,already（已經(jīng)）,never（從來沒有）,ever（曾經(jīng)）,before（以前）,yet（仍然）,

once（一次）,twice（兩次）,many times（很多次）,how many times（多少次）,so far（迄今為止）,during the past（last）three years（最近三年來）等連用.

※副詞的位置：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用于疑問句中,句型為: Have / Has＋主語＋ever ＋過去分詞?“…曾經(jīng)……過嗎?”用于詢問某人過去的經(jīng)歷.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.

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用法二：表示過去已經(jīng)開始,一直延續(xù)到現(xiàn)在的動作或狀態(tài).時間狀語有：

①for＋表示一段時間的詞語I have taught English for 19 years.

②since＋表示過去時間點的詞語He has been at this school since 1986.

③since＋表示過去的時間狀語從句I have lived here since I was born.

④since＋一段時間＋ago. I have known him since 20 years ago.

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看完了上面的語法知識，相信大家已經(jīng)對現(xiàn)在完成時的用法有了更進一步的理解，喜歡就收藏吧~