A.現在完成時涉及過去和現在,表示情況發生在過去,但結果是在現在
B.have+過去分詞
positive form: I have washed./He has washed.
negative: I haven't washed./He hasn't washed.
question: Have I washed?/Has he washed?
C.過去分詞形式
規則動詞:-ed
不規則動詞:be-been/have-had...
A.現在完成時涉及過去和現在,表示情況發生在過去,但結果是在現在
B.have+過去分詞
positive form: I have washed./He has washed.
negative: I haven't washed./He hasn't washed.
question: Have I washed?/Has he washed?
C.過去分詞形式
規則動詞:-ed
不規則動詞:be-been/have-had...