IV. Find and correct a mistake in each sentence: 1. The boy was enough intelligent to solve that problem. 2. The girl helped me with the needlework yesterday is my classmate. 3. They asked their friends not play soccer in the road. 4. Hanh is the same weigh as my sister. 5. It is careless for you to leave your book on the train. 6. My brother used to going to the movies with our father. 7. Hoa asked me if I could have a picnic with her in the country or not. 8. Most of monkeys both in the forest and in the zoo are interesting in bananas. 9. It takes Nam thirty minutes going to school on foot everyday. 10. Not only Ha but also her friends was present in my fifteenth birthday party.

1. enough intelligent `->` intelligent enough (adj/adv + enough)

2. helped `->` helping (Mệnh đề quan hệ rút gọn sử dụng V_ing để mang ý chủ động; MĐQHRG sử dụng Vp.p để mang ý bị động)

3. play `->` to play (Câu tường thuật mệnh lệnh: (Don't) + V + O! `->` S + ask/tell/warn/advise O + (not) to V)

4. weigh `->` weight (n): trong lượng (the same + (noun) + as; weigh (v): cân)

5. for `->` of (It + tobe + adj + of s.one + to do s.th: ai như thế nào khi làm gì; It + tobe + for s.one + to do s.th: như thế nào cho ai làm gì)

6. going `->` go (used to do s.th: đã từng quen với)

7. if `->` wether (Trong câu tường thuật với or, ta sử dụng wheter thay cho if)

8. interesting `->` interested (tobe interested in)

9. going `->` to go (It takes s.one + time/money + to do d.th)

10. was `->` were (her friends là S số nhiều)