一轮复习 As 引导的状语从句用法

As 引导的状语从句 “as" 作连词用时，可以引导时间状语从句、原因状语从句、方式状语从句、比较状语从句和让步状语从句。 1. “as” 引导时间状语从句时，从句的谓语动词既可是延续性的，也可是瞬间性的，强调主句和从句的动作相继或同时发生。当从句中的谓语动词是延续性动词时，可以将 as 替换成 when 或while。例如： 1) I saw him as he was getting off the bus.当他下公共汽车时，我看见了他。 2). The teacher came in as they were laughing.他们正在大笑，老师进来了。 但当表示“一边 一边”或“两个动作同时发生”之意时，只能用!"。例如： 1). We talked as we walked. 我们边走边谈。 2). He became less active as he grew older.随着年龄的增长，他变得越来越不活跃了。 I read the letter, as I walked along the river. 我一边沿着河走，一边看这封信。 2.As引导原因状语从句时，意思是“由于，鉴于”，从句说明原因，主句说明结果，从句一般位于句首。例如： As it was getting late, we soon turned back. 因为时间已晚，我们随即归来。 As it is ranining hard, you had better put on your raincoat.由于天下磁卡大雨，你最好穿上雨衣。 As he was not ready in time, we went without him.国他未到及时准备好，我们没有等他就去了。 As his family was unable to pay tuition, he was forced to give up his studies.由于他家不骨能力支付学费，他被迫辍学了。 As he was ill,I deciede to go without him.因为他身体不好，我决定独自去了。 3.As引导方式状语从句时，意思是“按照，如同”。例如： I have changed it as you suggested. 我已按照你建议的那样改了。 You