4.My mother had gone to work before I got up. -> After my mother had gone to work,I got up

5.Someone has stolen my bicycle. .-> My bicycle has been stolen

6.If he doesn’t work hard, he will not pass his exam. -> Unless you don't work hard, you will pass the exam.

7 I don’t have free time , so I can’t go some where. -> If I had free time,i can go some where