S1B4状语从句.ppt

在下列结构中，when作“在那时”讲，表示某件事正在发生或刚刚发生时，这时另一动作发生… be about to do…when… She was about to start out when the telephone rang. be doing…when… I was having my supper when a friend of mine called in. had done…when… We had just crossed the street when someone called me. be on one’s way…when… We were on our way to the station when we found a girl crying by the roadside. be on the point of doing…when… 1.It was raining hard _______ I got home. 2.I was doing my homework _______ my brother was playing games. 3.____ we walked, we talked. 4.We do not necessarily grow wiser ___ we grow older. 5._____ I have finished, I’ll tell you. 6.He was just about to leave, _______the telephone rang. 7.She thought I was talking about her daughter, _______ in fact, I was talking about my daughter. 8.We were watching TV ______ the light went out. 4.Before 句型： It will be long before sb does sth 要过很久某人才会…… It will be + 一段时间 + before sb does sth 某人要过多长时间才做…… It won’t be long before sb does sth 不用多久某人就会…… It was long before sb did sth 过了很久某人才做… It was + 一段时间 + before sb did. Sth 某人过了多长时间才做…… It won’t be long before he finishes his writing. It will be two years before he leaves the country. It wasn’t two years before he left the country. 6.since (from the time that) 句型：现在完成时 + since + 过去式 I have worked here since I graduated from the university. 句型：It is… since… It is (has been) two years since he came here. as soon as  As soon as he comes back, I will let you know. 我一离开争吵就开始了. As soon as I left, the quarrel started. hardly/scarcely/barely…when… no sooner…than… 主句用过去完成时，从句用一般过去时 I had hardly left when the quarrel started I had no sooner left than the quarrel started. 时态不同,主从句位置颠倒；主句倒装，从句不倒 Hardly had I left when the quarrel started. No sooner had I left than the quarrel started. 1.because 1)回答why提问(从句中所说的理由是听话人不知道的） Why were you absent? Because I was not well. 2)可被just, only, simply, mainly, 等修饰,since/as不可 The doctor looks tired simply/only because he sat up all night. 3)用于强调句型