現(xiàn)在完成時(shí)，during+時(shí)間，表示在某段時(shí)間里，常用作現(xiàn)在完成時(shí)態(tài)的時(shí)間狀語?，F(xiàn)在完成時(shí)態(tài)常接時(shí)間狀語：如so far，by now，up to(till)now，for，since，in the past few…，during the last few…等。We have planted more than two thousand trees by now。

1. 表示“在……期間”，是介詞，不要將其誤用作連詞。如：

他在巴黎期間，與他的朋友住在一起。

誤：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.

2. during 和 for 均可表示一段時(shí)間，但兩者有差別。

(1) during 通常表示事件發(fā)生在何時(shí)(when)，而for則表示事件持續(xù)了多長時(shí)間(how long)。如：

He was in hospital for six weeks during the summer. 他在夏天住了 6 個(gè)星期的醫(yī)院。

(2) 兩者之后均可接由 the whole 引起的時(shí)間短語，但通常不能接由 all 引起的時(shí)間短語。如：

他整個(gè)夏天都住在那兒。

正：He stayed there for [during] the whole summer.

誤：He stayed there for [during] all the summer.

(3) 在“數(shù)詞+時(shí)間名詞”之前以及在some time, a long time之類表示泛指一段時(shí)間的詞組之前，可用介詞 for，但不用 during。如：

He lived here for ten years (for some time). 他在這兒住過 10 年(一段時(shí)間)。

3. during與in均可表示“時(shí)間點(diǎn)”，有時(shí)可互換。如：

I'll be on holiday in [during] August. 我將在8月度假。

He woke up three times in [during] the night. 夜里他醒了 3 次。