1. ever visit -> have ever visited
-> thì HTHT have/has ever V3/ed
2. will sit -> will be sitting
-> this time next week (thì TLTD)
3. played -> playing
-> HTHTTD : hành động xảy ra ở quá khứ, tiếp tục ở hiện tại và có thể tiếp diễn trong tương lai
4. writing -> was writing
-> when QKĐ, QKTD
5. will have -> will be having
-> from nine to ten in this room (TLTD)
6. made -> have been making
-> HTHTTD : hành động xảy ra ở quá khứ, tiếp tục ở hiện tại và có thể tiếp diễn trong tương lai, hành động đã hoàn thành nhưng kết quả vẫn ở hiện tại 
7. have been speaking -> had been speaking
-> QKHTTD : hành động đã đang diễn ra, kết thúc trước một hành động khác trong quá khứ
8. stopped -> stops
-> S can't V until S Vs/es
9. had got -> got
-> các hành động liên tiếp xảy ra trong quá khứ
10. had they played -> were they playing
-> QKTD when QKĐ

1 box => boxes

2 soon => sooner

3 than => than that in the

4 like => as

5 work => to ửok

6 for => to

7 saw => had seen

8 who => whom

9 good=> fine

10 hadn't better => had better not

Most => more

the most⇒more

Ex 3: Tìm và sửa lỗi sai (nếu có) các câu dưới đây:

1. This is the more wonderful book she has ever read. => most

2. No mountain in the world is the biggest than Everest. => bigger

3. Bill Gate is the richer people in the world. => richest

4. The bed room is biggest than the kitchen one. => bigger

5. One of the greater football players in Vietnam is Quang Hai. => greatest

6. This is the more wonderful movie she has ever seen. => most

7. No river in Viet Nam is the longer than Red River. => bỏ

8. Sally is the thinner girl in the class. => thinnest

9. The kitchen is smallest than the living room. => smaller

10. One of greatest football players in the world is Critsiano Ronaldo => the greatest

Ex 5. Chọn đáp án đúng.

1.His illness was ________ than we had thought at first.

A. much serious

B. more serious

C. serious

D. most serious

2. Nam is _______ in his class.

A. taller

B. the most tall

C. the tallest

D. more tall

3. Traveling by plane is _______ than traveling by car.

A. fast

B. more fast

C. the most fast

D. faster

4. Actually, today I feel ______ than I did yesterday.

A. the worst

B. worst

C. worse

D. bad

5. Could you speak Vietnamese _______ than, so I can understand what you mean?

A. more clearly

B. clearly

C. the most clearly

D. the clearest

6. That flight ticket is _________ of all.

A. expensive

B. the most expensive

C. more expensive

D. the expensive

7. Phong works ________ than most of him friends.

A. a lot more hardly

B. more hardly

C. many harder

D. much harder

8. I tried to spend ______ money.

A. little

B. less

C. the least

D. the less than

9. My friend is much _______ than me.

A. prettier

B. pretty

C. the prettiest

D. more prettier

10. My mom speaks Korean ______ I do.

A. fluently

B. more fluently than

C. more fluently

D. most fluently

11) What is the superlative of “fat”?

A. fattiest                         

B. the fattest                     

C. fattest

12) What is the superlative of “interesting”?

A. the more interesting                   

B. the most interesting               

C. most interesting

13) Which word is NOT spelled correctly?

A. shortest                 

B. youngest                   

 C. happyest

14) Which is the…………planet form the sun?

A. far                       

B. furthest                       

 C. farrest

15) Which sentence is NOT correct?

A. That was the most hardest exam ever!

B. This is the best bar in the city.

C. She’s the worst volleyball player in the school.

16) Question 6 is…………….question in the test.

A. most difficult                 

B. difficultest                 

C. the most difficult

17) The fish is…………thing on the menu.

A. the best                       

B. the goodest                       

C. best

18) That was…………film I’ve ever watched.

A. most boring                   

B. the most boring                   

C. boring

19) Karen is………….student in class.

A. healthy                           

B. healthier                         

C. the healthiest

20) Yesterday was…………..day of the year.

A. hottest                     

B. hotest                     

C. the hottest

21. My Japanese class is _______ than his English class.

A. funny

B. funnier

C. funniest

D. the funny

22. This chair is _________ than the other.

A. comfortable

B. the comfortable

C. more comfortable

D. most comfortable

23. No one in my group is _______ than Duong.

A. kinder

B. kind

C more kind

D. most kind

24. Hoang visits his parents ________ than she does.

A. little

B. least

C. the less

D. less

25. If Cuong had run ________ , his brother could have caught him.

A. fast

B. faster

C. the fastest

D. more faster

Lỗi sai và sửa:

1. Where do you going now?
Sửa thành: Where are you going now?

2. The boys are running on the beach!
Đúng.

3. Danny has a long black hair.
Sửa thành: Danny has long black hair.

4. My friend's face has small and beautiful.
Sửa thành: My friend's face is small and beautiful.

5. Is your sisters playing the guitar in the room?
Sửa thành: Are your sisters playing the guitar in the room?

"Have you done this sort of work before?" She asked me.

=> She wanted to know ...........................................................................

Complete the second sentence so that it has the same meaning to the first.

Tìm lỗi sai và sửa lại

1. We had an excursion to the -> bỏ Lake Hudson, a man-made reservoir in Okalahoma last Sunday .

2. Different kinds of newpapers arranged -> are arranged on the shelves when the teacher came into the class .

3. The Great Wall is China's longer -> longest structure .

more=>most

the biggest=>bigger than

richer=>richest

biggest=>bigger

greater=>greatest

1 more => most

2 the biggest => bigger

3 richer => richest

4 biggest => bigger

5 greater => greatest

1. more -> most

2. the biggest -> bigger

3. richer -> richest

4. biggest -> bigger

5. greater -> greatest

1. Taller ~> Tallest

2. Shortest ~> Shorter

3. China ~> Chinese

4. In ~> Is

1.  taller → tallest

2.  shortest → shorter

3.  China → Chinese

4.  in the world's → is the world's

1taller-tallest

2shortest-shroter

3china-chinese

4in china-of china

Tìm lỗi sai rồi sửa

1. Her hobbies are different to =>from me

2. There are any => some oranges on the tables in the kitchen

3. How much is => does one kilo of rice cost ?

4. There are some apples but there aren't any bananas

=> Hình như câu này đúng mà bạn ???

5. The author of this play is the same like => as that play

6. My husband likes mango , and my brother does , either=>too

1. Her hobbies are different from mine.                         (be different from)

2. There are some oranges on the tables in the kitchen. 

3. How much does one kilo of rice cost?         

4. There are some apples but there aren't any bananas.

5. The author of this play is the same as that play.

6. My husband likes mango, and my brother does, too.    ("too" dùng với câu khẳn định, "either" dùng với câu phủ định)