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时间状语从句的从属连词when, while， as用法上有何区别？ 根据句子意思选择最佳词语(when, while, as)填空(每空一词) 1. ________she came in, I was watching TV. 2. Would you please look after my pet dog ______I was away on business? 3. The head teacher laughed ____he spoke. Obviously, he was satisfied with our performance. while as When 6 表示 “当……时候”时，when可接短暂性或延续性动词，既可表点时间，也可表段时间；while只能接延续性动作，表段时间；as强调两个动作同时发生，常译为“一边……一边……”。 7 原因状语从句的从属连词as, since, because用法上有何区别？ 根据句子意思选词(as, since, because)填空(每空一词) 1. It is __________ he is ill that he isn't here celebrating your birthday. 2. ______ you have known the truth from head to toe, I won't give any explanation. 3. _____ the weather is not so helpful, we had better prepare two plans in advance. As Since because 7 表达原因时，使用as, since，because等从属连词，它们的区别主要是语气上的区别，但在实际运用中，语气是很难把握的东西，因此掌握相关句式和含义是关键。 because语气最强，表示与结果直接相关的原因，可译为“(正/就是)因为”，所以常用于强调句型或回答why引导的问题。 7 | 
