Do we use them for posting letters?Where did you build the bridge?Can she finish her homework
问题描述：
Do we use them for posting letters?Where did you build the bridge?Can she finish her homework
还有一个,We heard Tom sing an English song just now.
都改为被动语态!
答
1.Are they used for posting letters ?
2.Where were the bridge built (by you) ?
3.Can her homework be done (by her )?还有一个问题呢？？？Tom was heard to sing an English song just now (by us ).