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3. His parents gave the boy a key to unlock the front door. 4. The English call gas petrol. Gas is called (by the English) petrol. 2 从简单句角度，哪些主动句可以改成被动句？ The boy was given (by his parents) a key to unlock the front door./A key was given (by his parents) to the boy to unlock the front door. 5. It remains a big problem. 6. I had my hair cut the other day. 7. Who let you touch my books? 8. This is the best choice made by you so far. 不能改为被动句。因谓语动词为半系动词remain。 不能改为被动句。因谓语动词为使役动词have。 By whom were you let to touch my books? 不能改为被动句。因谓语动词为系动词is。 2 从简单句角度，哪些主动句可以改成被动句？ 2 主动形式的简单句中，主谓宾，主谓双宾，主谓宾补三类句子可以改为被动句。改为被动句的关键是句子中有“及物动词＋宾语”结构。连系动词be(am/is/are)，使役动词have (has/had)，半系动词及所有不及物动词均无被动语态。 翻译下列句子，指出主动表被动的情形 1. This kind of cloth feels soft. 这种布料摸起来很柔软。 3 主动表被动的句型有哪些？ 2. The library opens at 8 a．m. and closes at 5 p.m. 图书馆早上8点开门，下午5点关门。 3. The cloth washes well. | 
