作业帮回答一下
来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/05/01 14:03:22
请问：while ，when，after，before，as soon as在句中它前后的时态都分别是什么？在做完成句子的时候错了好多。。。
解题思路： 见过程
解题过程：
这几个词都是连词，引导时间状语从句，在时间状语从句中，要注意时态一致。一般情况下主句是将来时的时候，从句主要用一般现在时。
I will call you as soon as I arrive in Beijing. 我到北京就将给你打电话
但如果从句是过去时，要注意，
when引导的从句的谓语动词可以是延续性的动词，又可以是瞬间动词。并且when有时表示“就在那时”。 例如： When she came in, I stopped eating.她进来时，我停止吃饭。(瞬间动词) When I lived in the countryside, I used to carry some water for him.当我住在农村时，我常常为他担水。（延续性的动词） We were about to leave when he came in.我们就要离开，就在那时他进来了。(瞬间动词) While引导的从句的谓语动词必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。例如： While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时发生) I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。（对比） after在...之后 He left the classroom after he had finished his homework . 他做完作业之后就离开教室。 before 在...之前 Mr. Brown had worked in a bank for a year before he came here. 布朗先生来这里之前已经在一家银行里工作一年了。 as soon as 一。。。就。。 We began to work as soon as we got there. 我们一到那就开始工作。
最终答案：略
解题过程：
这几个词都是连词，引导时间状语从句，在时间状语从句中，要注意时态一致。一般情况下主句是将来时的时候，从句主要用一般现在时。
I will call you as soon as I arrive in Beijing. 我到北京就将给你打电话
但如果从句是过去时，要注意，
when引导的从句的谓语动词可以是延续性的动词，又可以是瞬间动词。并且when有时表示“就在那时”。 例如： When she came in, I stopped eating.她进来时，我停止吃饭。(瞬间动词) When I lived in the countryside, I used to carry some water for him.当我住在农村时，我常常为他担水。（延续性的动词） We were about to leave when he came in.我们就要离开，就在那时他进来了。(瞬间动词) While引导的从句的谓语动词必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。例如： While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时发生) I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。（对比） after在...之后 He left the classroom after he had finished his homework . 他做完作业之后就离开教室。 before 在...之前 Mr. Brown had worked in a bank for a year before he came here. 布朗先生来这里之前已经在一家银行里工作一年了。 as soon as 一。。。就。。 We began to work as soon as we got there. 我们一到那就开始工作。
最终答案：略