11. Peter has a part-time job. He needs to get some extra money.

- >  Peter has a past-time job to get extra money.

22. My mother went to the post office. She had to post some letters.

- >  My mother went to the post office to post some letters.

33. Mary stayed at school until 9 p.m. She must finish her project.

 - > Mary stayed at school until 9 p.m finish her project.

44. Peter sent Mary an e-mail. He wanted to wish her a "Happy Birthday".

- > Peter sent Mary an e-mail to wish her a"Happy Birthday".

55. Paul did some exercises. He wanted to lose weight.

- > Paul did some exercises to lose weight.

 Sheila went to school by bus to save money.: 
->Sheila went to school to save money
 Peter has a part-time job. He needs to get some extra money.

- >  Peter has a past-time job to get extra money.

. My mother went to the post office. She had to post some letters.

- >  My mother went to the post office to post some letters.

Mary stayed at school until 9 p.m. She must finish her project.

 - > Mary stayed at school until 9 p.m finish her project.