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dur•ing(ˈdʊər ɪŋ, ˈdyʊər-)
You use during or in to say that something happens continuously or often from the beginning to the end of a period of time.
In sentences like these, you can almost always use in instead of during. There is very little difference in meaning. When you use during, you are usually emphasizing that something is continuous or repeated.
You can also use during to say that something happens while an activity takes place.
You can sometimes use in in sentences like these, but the meaning is not always the same. For example, 'What did you do during the war?' means 'What did you do while the war was taking place?', but 'What did you do in the war?' means 'What part did you play in the war?'
Both during and in can be used to say that a single event happened at some point in the course of a period of time.
It is more common to use in in sentences like these. If you use during, you are usually emphasizing that you are not sure of the exact time when something happened.
Don't use during to say how long something lasts. Don't say, for example, 'I went to Wales during two weeks'. You say 'I went to Wales for two weeks'.
during[ˈdjʊərɪŋ] prep → pendant
during the day → pendant la journée