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in +时间段，用于一般将来时或将来时态中，表示 ‘……之后’
1.I will arrive in three hours’ time .
2.He will be back in ten minutes or half an hour .
3.He will finish his work in twenty minutes’ time .
He works as a teacher .
As I was a child , I lived at the village .
Do as I told you .
As it was raining , I stayed at home .
As I was late ,I was in a hurry .
He is as tall as my brother .
将来完成时构成：主语+will / shall + have + 过去分词
