when的用法举例,when的前后时态口诀

when的用法举例,when的前后时态口诀

⊙▽⊙ when=as=while 当…的时候(当while翻译成当…的时候，后面一定要跟进行时态) before after since(自从，主句一定会用完成时例：i have fallen in love with you,since i met you) th(1)We were about to start when it began to rain. 我们刚要出发就开始下雨了。(2)He was on the point of leaving when someone knocked at the door. 他刚要走就有人敲门。

WHEN + 表达式THEN + 输出ELSE + 输出END 还可以继续加，, 类比python中条件语句的：if 表达式：输出elif 表达式：输出else: 输出举例看看：用上篇博客如：( 1 ) When you see him, please say hello to him. 见到他时，代我问他好。 2 ) When you have finished your experiment, please tidy the lab and put

╯ω╰ when的用法when的句子结构常用于以下句型中：1)主语+bedoing…when(suddenly)…意思是“正在做某事这时(突然)……”；2)主语+beabouttodo…when…主语+beonthepointof(doing)…when…意思是“1、when doing用法When从句的主语和主句的主语是同一个或同一些人时，从句的谓语动词为be动词+doing形式，可以把从句的主语和be动词省略，即用when doing sth是指

2.be about to do sth…when…例：We were about to start when it began to rain. 我们刚要出发，天就开始下雨了。3.had not done sth…when…hardly…when…例：He had not fall1、be doing when。意思是：表示“正在做某事，就在这时……”用法例句：I was watching the football match when h