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I can finish this exercise but I am not sure that my proof is right.
Would you mind checking it for me?
Rewrite as directed: ( my solution is in parentheses)
1> Parking is not permitted here.
--> You are not ..........................................
( You are not allowed to park here.)
2> " Would you like to come on a picnic with us?" he said.
---> He invited me .........................................
( He invited me to a picnic with them.)
3> " If you can't find anyone else, I 'll drive you to the airport,"he said to me.
--> He volunteered .............................................
( He volunteered to drive me to the airport)
4> Valerie found it hard to concentrate on her book because of the noise.
--> Valerie ............................................ her book because of the noise.
( Valerie hardly concentrated on her book because of the noise.)
5> " You'd better go to the doctor if you've got a pain in your back, Anna," Henry said.
---> Herry suggested ..........................................
( Herry suggested that I should go to the doctor.)
6>" I'm sorry I'm late.", she said." The bus broke down."
-----> She apologised ......................................................
( She apologised being late because the bus broke down.)
7> " If you don't pay the ransom, we'll kill the boy," said the kidnappers.
------->The kidnapper threatened .........................................................
(The kidnapper threatened that they would kill the boy whether he didn't pay the ransom.)
Thanks in advance.
Comments  
3. He volunteered to drive me to the airport if I can't find anyone else.

6. She apologized for being late because of the bus broken down.

7. The kidnapper threatened me with killing the boy if I didn't pay the ransom.
Don't you have to write as many words as possible from the original sentence in your answer?
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3. He volunteered to drive me to the airport if I can't find anyone else.

6. She apologized for being late because of the bus broken down.

7. The kidnapper threatened me with killing the boy if I didn't pay the ransom

The boldened words are not correct.
Don't you have to write as many words as possible from the original sentence in your answer?
Yes, I have to.
If you find my solution wrong, please correct it for me.
Your solutions are not wrong, it's just that in some it's possible to use more of the original words. Let me have a look.

P.S.: your latest post was barely readable... Emotion: tongue tied
Teachers: We supply a list of EFL job vacancies
1> Parking is not permitted here.
--> You are not ..........................................
( You are not allowed/permitted to park here.)
2> " Would you like to come on a picnic with us?" he said.
---> He invited me .........................................
( He invited me to /go? on a picnic with them.)
3> " If you can't find anyone else, I 'll drive you to the airport,"he said to me.
--> He volunteered .............................................
( He volunteered to drive me to the airport) OK
4> Valerie found it hard to concentrate on her book because of the noise.
--> Valerie ............................................ her book because of the noise.
( Valerie hardly concentrated /could hardly concentrate?on her book because of the noise.)
5> " You'd better go to the doctor if you've got a pain in your back, Anna," Henry said.
---> Herry suggested ..........................................
( Herry suggested that I /Anna should go to the doctor.)
6>" I'm sorry I'm late.", she said." The bus broke down."
-----> She apologised ......................................................
( She apologised being late because the bus broke down.) No
7> " If you don't pay the ransom, we'll kill the boy," said the kidnappers.
------->The kidnapper threatened .........................................................
(The kidnapper threatened that they would kill the boy whether NO he didn't pay the ransom.)