Из действительного в страдательный.

1-The quests sang us a song.

2-I can recommend you a good book.

3-Someone wrote me a funny letter.

4-Tom is reading the text to me.

5-My boss has mentioned this idea to me.

1-The quests sang us a song. A song was sung by the quests

2-I can recommend you a good book A good book can be recommended me by him.

3-Someone wrote me a funny letter. A funny letter was written me by someone

4-Tom is reading the text to me. The text is being read to me by tom

5-My boss has mentioned this idea to me. This idea has been mentioned to me by my boss