【正文】
evening he ___________ (write) that letter. 2. 他說他以前見過你。 By six o’clock they ____________ (work)for eight hours. When I came to GZ , he _____________(be) there for a long time. 用法: 1. 到了六點鐘為止,他們已經(jīng)工作了八小時了。 在強調(diào)過去某一個動作發(fā)生在另一個動作前常常用過去完成時態(tài)。在強調(diào)過去某一動作發(fā)生在另一動作之前時。 By six o’clock they ______________(work) for eight hours. had worked 過去分詞的構成: 1. 規(guī)則動詞的變化: a) 一般情況下在動詞后面加 ed work worked play played b) 以 e 結(jié)尾的動詞直接加 d use used refuse refused c) 以輔音字母加 y 結(jié)尾的動詞,把 y