1.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.
2.during 和 for 均可表示一段时间,但两者有差别.
(1) during 通常表示事件发生在何时（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 6 个星期的医院.
(2) 两者之后均可接由 the whole 引起的时间短语,但通常不能接由 all 引起的时间短语.如：
他整个夏天都住在那儿.
正：He stayed there for [during] the whole summer.
误：He stayed there for [during] all the summer.
(3) 在“数词+时间名词”之前以及在some time,a long time之类表示泛指一段时间的词组之前,可用介词 for,但不用 during.如：
He lived here for ten years (for some time).他在这儿住过 10 年（一段时间）.
2.during与in均可表示“时间点”,有时可互换.如：
I’ll be on holiday in [during] August.我将在8月度假.
He woke up three times in [during] the night.夜里他醒了 3 次.
但在使用时还有以下几点要注意：
(1) 比较而言,during 更强调时间的延续,in 只是指一般性的某一时间.因此若表示状态或习惯性动作,多用during,否则以用in为常见.如：
Many people suffered hardship during the war.许多人在战争期间受苦遭难.
He was injured in the war.他在战争期间受了伤.
(2) 在stay,visit,meal等表示行为要持续一段时间的名词之前,只能用during 而不能用in.如：
The phone rang during the meal.吃饭时电话铃响了(www.***.com).
I went to see my aunt during my stay in Beijing.在北京逗留期间,我去看了我的姑妈.
(3) 与季节名词连用,in表泛指,during表特指.如：
In summer we often camp in the forest.夏天我们常在森林里露营.（泛指）
During the summer we camped in the forest.今年夏天我们在森林里露营.（特指）
你的问题在开头有解释,
