赖世雄教你学英语语法
两句的连接方法
3-8：while可做连接副词及并列连词
1.表“当……”时，while视为连接副词，引导副词从句
例：While I was writing a letter,she was doing the dishes.
（当我在写信时，她在洗盘子。）
2.表“而……”时,while视为并列连词，引导主句
例：He is nice,while/whereas his brother is bad.
=While he is nice,his brother is bad.
（他很好，而他弟弟却很坏。）