B1 : chuyển sang câu bị động 1 : They are tidying their room now 2: Jack repaints his house once every year 3: we are going to sell this computer 4: they use milk for making butter and cheese 5: do they teach English here? 6: she gives me two different kinds of dictionaries 7:we must take good care of book borrowed from the library 8: my father often tells me many things about the war 9: will they intive her to your wedding party 10: he was repairing some electric devices then