1. they went there once ---->have gone.
2, mr.and mrs.taylors has just been on holiday ---->have
3 he learns english for 3 years but the can't even read a newspaper yet ---->has learning
4.she has written a report for last night ---->since
5 the rain has ceased yesterday ---->ceased
6 he has wash his car for one hous ---->cau voi cha cu,viet sai tem lem ma cu di hoi he has wash his car for one hous ---->washed hours