1. Does ... help??? ... is ... does
2. doesn't enjoy ... playing ... enjoys ... watching
3. Didn't ... look
4. are ... do ... do
5. Does ... rise ... rises ... sets
6. Is ... eating
7. open
8. need
9. does ... rain
10. isn't writing ... is playing
11. doesn't have ... has
12. watches ... is watching
13. swims ... is going
14. play ... are playing
15. rides ... walked/walks
16. Do ... work ... do
17. Who does ... belong ... belongs
18. sees ... don't see
19. Is ... teaching ... is teaching ... love ... is
20. are sleeping ... laugh!
Giải thích:
- Thì hiện tại tiếp diễn: S + tobe (not) + V-ing ...
- Thì hiện tại đơn: S + (don't/doesn't) + V(s/es - đã có phủ định trước thì không thêm s/es) ...