Rewrite the sentences in passive voice. (http://www.ego4u.com/en/cram-up/grammar)
She sang a song. - A song was sung by her. ('a song' becomes the subject. As it is third person singular, we use was + past participle.irregular verb: sing - sang - sung )
Somebody hit me. - I was hit by somebody. ('I' becomes the subject. As it is first person singular, we use was + past participle.irregular verb: hit - hit - hit )
We stopped the bus. - The bus was stopped by us. ('the bus' becomes the subject. As it is third person singular, we use was + past participle.Note: 'p' must be doubled when adding '-ed' as 'o' before 'p' is a short, stressed vowel. )
A thief stole my car. - My car was stolen by a thief. ('my car' becomes the subject. As it is third person singular, we use was + past participle.irregular verb: steal - stole - stolen )
They didn't let him go. - He was not let go by them. ('he' becomes the subject. As it is third person singular and a negative sentence, we use was + not + past participle.irregular verb: let - let - let )
She didn't win the prize. - The prize was not won by her. ('the prize' becomes the subject. As it is third person singular and a negative sentence, we use was + not + past participle.irregular verb: win - won - wonDon't use 'did' with a form of 'to be' )
They didn't make their beds. - Their beds were not made by them. ('their beds' becomes the subject. As it is plural and a negative sentence, we use were + not + past participle.irregular verb: make - made - madeDon't use 'did' with a form of 'to be'. )
I did not tell them. - They were not told by me. ('them' becomes the subject. As it is plural and a negative sentence, we use were + not + past participle.irregular verb: tell - told - toldDon't use 'did' with a form of 'to be'. )
Did you tell them? - Were they told by you? ('they' becomes the subject. As it is plural and a questin, we use Were + subject + past participle.irregular verb: tell - told - toldDon't use 'did' with a form of 'to be'. )
Did he send the letter? - Was the letter sent by him? ('the letter' becomes the subject. As it is third person singular and a question, we use Was + subject + past participle.irregular verb: send - sent - sentDon't use 'did' with a form of 'to be'. )