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while doing 是现在分词短语用于连词之后,作用相当于一个时间状语从句。现在分词这样用的前提是两个动词的主语是同一个,并且这两个动作通常是同时发生(即这句话一定要是进行时态)。如果主语不一致则必须用从句。
三种表示一段时间以后,另外一件事情发生的方式
| a note said… 纸条上说… the picture said… 图片上说… newspaper said… 报纸上说… | , "Hi, Mom! Have a nice day!" |
|---|---|
| ,"I can't even tell what that is." | |
| ,"there will be a heavy rain tomorrow.." |
在句子中,我们并不想强调某个人,只要说这个事的时候就喜欢“主动变被动”,突出“事”为主体,弱化“人”。
| 普通表达(someone)突出“人” | 被动表达(重点前移)突出“事”为主体,弱化“人” |
|---|---|
| Someone will translate the book into English. | The book will be translated into English. |
| Someone must send a telegram to him. | A telegram must be sent to him. |
| Someone had put out the fire before the fire brigade arrived. | The fire had been put out before the fire brigade arrived. |
| Someone gave the cat some milk to drink. | The cat was gaven some milk to drink. |