有5个问题,就是把句子转换成被动语态的习题.如下

有5个问题,就是把句子转换成被动语态的习题.如下
改写下列句子,将斜体印出的词和词组作主语.1、l will send a message immediately.2.We must sel all these goods.3.I told you he would receive the parcel in time.4.He has to deliver the letter by hand.5.They must have lost your letter in the post.