12. Lan hasn’t written to Maryam for a month.
à It is a month since …………………………………………………………………...……
13. "I won't help you with your homework. Never!” Katarina said to me.
à Katarina refused …………………………………………………………..........………......
14. It is a long time since we last met.
=> We haven't........................................................................
15. My father had watered all the plants in the garden by the time my mother came home.
=> Before ..............................................................................
16. The students have discussed the pollution problems since last week.
=> The pollution problems.....................................................
17. He loses his job because he is late every day.
=> If.......................................................................................
18. I’ll call the police if you don’t leave me alone.
=> Unless...............................................................................