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幼苗
共回答了15个问题采纳率:80% 举报
基本结构:have/has + done
否定形式:have/has + not +done.
一般疑问句:have或has.
不带时间状语的现在完成时表示说话之前动作已经完成,而后果和影响至今存在.
I have seen the film many times.
The city has taken on a new look.
表示一直持续到现在的状态或状态、动作持续的时间
The conference has lasted five days.
I have learnt English for 5 years.
1年前
4