Bài tập 1: Điền dạng đúng của động từ và giải thích 3. She ...................(feel) sad if you ....................(not, give) her a gift. 4. If Peter ......................(go) to work late again, he .................(be) sacked. 5. No one .........................(know) the truth if you ................(not, reveal) 6. If the boy ....................(eat) that apple, he ....................(be) ill. 7. If you .....................(not, hurry), you .....................(miss) the bus. 8. Tell him about this story if you .........................(see) him. 9. If you ..........................(have) a day off where you..............(go)?\ 10. If he ..................(cook) the meal himself, help him. 11. If few people .....................(come) to the meeting, please postpone to the other day. 12. If it .......................(not, be) warm this afternoon, we ...................(put off) the game. 13. Your father ...............(pick) you up if you ..................(come) back late? 14. What you ..................(speak) if you ....................(meet) a foreigner? 15. Unless he .................(answer) all my questions, I ...................(not, help) him.