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It is difficult to concentrate for such a long time.
During answers the question ‘When?’: ‘During her stay here, she made a lot of good friends.’
For answers the question ‘How long?’: ‘I’ve been learning English for two years.’ ‘We’ve been
waiting here for almost an hour.’
2
My uncle has known me during all my life.
My uncle has known me all my life.
The baby cried during all night long.
The baby cried all night long.
When a phrase saying ‘how long’ begins with all, there is no preposition: ‘It rained all night.’ ‘He’s
been in bed all day.’
3
During waiting for the train, I met an old friend of mine.
While waiting for the train, I met an old friend of mine.
This was my biggest problem during I was living in the United States.
This was my biggest problem while I was living in the United States.
See Note
at WHILE
1
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