1. The girls began to clean their house one hour ago =>the girls 2. These boys started playing football in 200

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1. 1.The girls have cleaned their house for one hour

   – clean -> cleaned -> clean : lau 

   – Girls thuộc số nhiều nên chia have

   2.These boys have played football since 2007 

   – play -> played -> played : chơi 

   – Boys thuộc số nhiều nên chia have

   * Cấu trúc : 

   S + started/began + to V/V-ing + … + time

   -> S + has/have + Ved/V3 + for/since + time

   * Note : 

   since + mốc thời gian 

   for + khoảng thời gian 

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