时间状从
| 在句中作状语的从句叫作状语从句，修饰谓语、定语、状语或整个句子（考点：引导状从的连词） | |||||
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| 时间状从 | |||||
| 连词（词组） | 意思 | 用法 | |||
| when | 当……时 | ①引导的从句谓语既可用延续性动词也可用非延续性动词 ②从句的动作与主句动作可同时发生也可先后发生 |
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| Judy was having dinner when I saw her. | |||||
| while | 当……时/ 而 |
①强调主句和从句的动作同时发生/对比转折 ②从句谓语动词必须是延续性动词或表示状态的动词 |
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| Tom is playing the piano while Jerry is dancing. / The weather was fine while we were in Xiamen. | |||||
| until/ till （till 不可放句首） |
直到…… | 当主句为肯定句，意为“直到……为止”； 当主句为否定句，结构为“not...until”，意为“直到……才……” |
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| I’ll wait until/till the concert is over. / I didn’t go to bed until I finished my homework. | |||||
| before | 在……之前 | 有时译为“……之后才……”；“没来得及……就……” | |||
| I have to go home before it gets dark. | |||||
| as soon as | 一……就…… | 从句的动作发生后主句的动作也随之发生（主将从现/主过从过 | |||
| As soon as I get to Beijing, I will call you. / As soon as Bob got home, he drank some orange juice. | |||||