1. small - big

2. long - short

3. thin - thick

4. fast - slow

5. cheap - expensive

6. true - false

7. narrow - wide

8. deep - shadow

9. short - tall

10. weak - strong

11. always - never

12. shy - confident

13. smooth - rough

14. alone - together

15. fire - water

16. human - woman

17. a lot of - a little

18. play - work

19. subtract - add

20. sit - stand

21. on - outside

22. begin - finish

23. dangerous - safe

24. turn on - turn off

25. before - after

26. girl - boy

27. hard - soft

28. easy - hard

29. smalt - stupid

30. hello - bye

Tham khảo!

Tall # short

fat # thin

high # short

much # less

big # small 

far # near

Able # unable 

Heavy # light 

dark # shine
laugh # cry

possible # impossible 

Night # day

correct # wrong

sad # happy

up # down

difficult # easy. 
first # last. 
Fast # slow 
Increase # decrease 

Noisy # quiet

Lock # unlock

Like # unlike

Few # many

Strong # weak

healthy # sick

win # lose 

old # young 

old # new

Rich # poor