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現(xiàn)在,我已經(jīng)完成了所有的作業(yè)。 ② +過去的時(shí)間點(diǎn),主句用過去完成時(shí); 例: By yesterday, the building had been pleted. 截止昨天,這個建筑就已經(jīng)完成了。 ③ +將來的時(shí)間點(diǎn),主句用將來完成時(shí)。 例: By tomorrow, all the students will have been out of the school. 到明天所有的學(xué)生 都將離校。 1. Tim went into the bathroom. Mary got up. ____________________________________________________________________________ 2. The co?ee became cold. I put cream in the co?ee. ____________________________________________________________________________ 4a Make sentences using by the time or before. By the time Mary got up, Tim had already gone into the bathroom. Before I put cream in the coffee, the coffee had bee cold. teacher collected the math homework. 3. I got to school. _ _ pleted the work for my boss. 4. The workday ended. _ _ By the time I got to school, the teacher had collected the math homework. By the time the workday ended, I had pleted the work for my boss. movie started. 5. I arrived at the cinema. __ __ mother finished making the apple pie. 6. I got home from my language course. __ __ _ By the time I arrived at the cinema, the movie had started. By the time I got home from my language course, my mother had finished making the apple pie. the time I arrived at the party, 2. everyone else_______ already _________