while用法
while这个词在不同的语境下有不同的用法，以下是while的几种常见用法：
| 用法 | 释义 | 示例 |
|---|---|---|
| 引导时间状语从句 | 表示“当...时候”，注意while后面的谓语动词一般为延续性动词，表示这个动作会延续一段时间 | While she was watching TV， she fell asleep. 她看电视看睡着了。 |
| 与此同时 | 无 | Today，professors routinely treat the progressive interpretation of history and progressive public policy as the proper subject of study while portraying conservative or classical liberal ideas—such as free markets and self-reliance—as falling outside the boundaries of routine， and sometimes legitimate， intellectual investigation. |
| 引导让步状语从句 | 表示“尽管...” | While polls show Britons rate \"the countryside\" alongside the royal family， Shakespeare and the National Health Service (NHS) as what makes them proudest of their country， this has limited political support. |
| 引导并列句 | 表示前后形成一种对比，可以翻译为“而...” | She loves playing piano， while her sister is only interested in guitar. |
