【正文】
my homework .(這個(gè)句子中就用了現(xiàn)在完成時(shí)態(tài)) 現(xiàn)在完成時(shí)的構(gòu)成 主 語(yǔ) +have (has) + 過去分詞 For example : have already finished my homework. has already bought a car 什么情況用 have 和 has 呢? 當(dāng)主語(yǔ)是“三單”時(shí)則用 has ,其它人稱用 have。 ) 其中 have not =haven’t has not = hasn’t 過去分詞的構(gòu)成分為 規(guī)則變化 和 不規(guī)則變化 兩種: 規(guī)則變化 : a) 一般情況下,在動(dòng)詞后直接加 ed, 如 playplayed, workworked, waterwatered, finishfinished等 。 (他剛把燈關(guān)了。 She has lived here since she was born. 自從她出生時(shí)就一直