错点1 将during误用连词

表示“在……期间”，是介词，不要将其误用作连词。如：

他在巴黎期间，与他的朋友住在一起。

误：During he was in Paris, he lived with his friends.

正：While he was in Paris, he lived with his friends.

正：During his stay in Paris, he lived with his friends.

由于 during 本身为介词，其后通常不再接介词短语。如：

误：During in Paris, he lived with his friends. (from www.yywords.com)

错点2 混淆during与for

during 和 for 均可表示一段时间，但两者有差别：during 通常表示事件发生的在何时(when)，而 for则表示事件持续了多长时间(how long)。如：

He was in hospital for six weeks during the summer. 他在夏天住了六个星期的医院。

A：When did he die? 他是什么时候死的?

B：During the last war. 是在上次战争中。(此句不能用 for)

A：How long did you live there? 你在那儿住过多久?

B：For about three years. 大约三年。(此句不能用 during)