有关while 用法while two defectives were keeping guard at the door ,two others opened the pacel.这里的WHILE可不可以换成WHEN.

分类: 作业答案 • 2022-02-18 13:15:06

问题描述：

有关while 用法
while two defectives were keeping guard at the door ,two others opened the pacel.
这里的WHILE可不可以换成WHEN.

答

while多跟时间段,加连续动词例如句中的keep guard ,也可以表转折,有然而的意思.when多加时间点,后跟短暂动词,如he was in the car when i saw him .中的see.但也可接连续动词while大多不能替换 when ,但when 大多...