这两个句子正好代表了 when 或 while 的两种不同用法。
1、在 I was telephoning a fridend when Bob came in. 这个句子中 when 相当于一个并列连词——
1)when = at that time 意思是“就在此时”
2)这种句子的特点是:
-- 主句:延续性动词的进行时态 —— I was telephoning a fridend (telephon 是延续性动词)
-- 从句:when/while + 主语 + 瞬时动词 —— when Bob came in (came 是瞬时动词)
3)这样的句子的意思是“某人正做某事,(这时候突然)发生了另一件事”。
另如:We were playing outside when/while it began to rain. 我们正在户外玩, 那时天下起雨来了。
本句的意思是:我这给朋友打电话,这时鲍比突然进来。
2、在 She didn't want to stay in bed while the others were working in the fields. 代表了另种用法,
1)when 或 while 表示“当...的时候”
2)其特点是:
-- 主句:谓语动词是瞬间动词——She didn't want to stay in bed (want 是瞬时动词)
-- 从句:用while 和 when 谓语动词有所区别——
* 如果谓语动词是延续性动词的进行时态,while 和 when 都可以使用,如 while/when the others were working in the fields.(work 是延续性动词)
* 如果谓语动词是瞬时动词,只能用 when,如 when the others came in (came 是瞬间动词)。
如:
例一(本句)She didn't want to stay in bed while the others were working in the fields. 其他人正在地里干活儿的时候,她不愿意赖在床上不起来。
例二(略加修改)She didn't want to stay in bed when the others came in. 别的人进来时她不愿意赖在床上不起来。
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