21. Stop talking or you will wake the children up. → If………………………………………..….…….
22. I lost her number, so I can't ring her up now. → If………………………………………..….……..
23. Mary got lost because she didn't have a map.→ If …………………………………….……..…….……
24. Linda felt sick because she ate lots of cakes.→ If………………………………………..….…….
25. June is so fat because he eats so many chips.→ If………………………………………..….…….
26. He does not work slowly enough, so he makes many mistakes.→ If………………………………………..….…….
27. Let me alone or I'll call the police→ If………………………………………..….…….
28. Perhaps you see Nam at school now. Tell him to come back home.→ If………………………………………..….…….
29. The doctor can’t see many patients because he is so late.→ If………………………………………..….…….
30. We don’t visit them in Hanoi because tickets are expensive. → If………………………………………..….…….
31. I’m busy right now, so I can’t help you.→ If………………………………………..….…….
32. I didn’t buy it because I didn’t have enough money.→ If………………………………………..….…….
33. I didn’t know that there was a test yesterday, so I didn’t study for it.→ If……………………………………..….…….
34. Because he’s very thin, he feels the cold so much→ If………………………………………..….…….
35. I didn’t eat breakfast several hours ago, so I am hungry now→ If………………………………………..….…….