首先,while不能夠引導(dǎo)賓語從句.但是,可以引導(dǎo)【時(shí)間狀語從句、讓步狀語從句】.例如：
While he had tried his best,he failed in again in the driving test.【讓步狀語從句】
While dreams are important in our life,they can also affect our action .【讓步狀語從句】
Tom was watching TV while his mother was cooking.【時(shí)間狀語從句】
While you are at the supormarket,please buy me a notebook.【時(shí)間狀語從句】
可見,while從句的時(shí)態(tài)不一定都要用過去時(shí).
祝你開心如意!