11. What if you studied every day?
a) You improve
b) You would improve
c) You will improve
d) You improved
Answer: b) You would improve
Explanation: Second conditional shows imagined results.
12. What if the sun stops shining?
a) The Earth freezes
b) The Earth would freeze
c) The Earth froze
d) The Earth freeze
Answer: b) The Earth would freeze
Explanation: Second conditional for unreal future events.
13. What would have happened if they had not called?
a) We don’t meet
b) We won’t meet
c) We wouldn’t have met
d) We didn’t meet
Answer: c) We wouldn’t have met
Explanation: Third conditional about past situations.
14. What happens if you don’t brush your teeth?
a) You will get cavities
b) You would get cavities
c) You get cavities
d) You got cavities
Answer: c) You get cavities
Explanation: Zero conditional for health facts.
15. What would you buy if you had a million dollars?
a) I buy a mansion
b) I bought a mansion
c) I would buy a mansion
d) I will buy a mansion
Answer: c) I would buy a mansion
Explanation: Second conditional imagines improbable wealth.
16. What would have improved your grades if you had started earlier?
a) Studying more
b) Studying much
c) Study more
d) Studied more
Answer: a) Studying more
Explanation: “Studying” fits grammatically in third conditional sentences.
17. What if she doesn’t finish the project?
a) She fails
b) She failed
c) She would fail
d) She will fail
Answer: d) She will fail
Explanation: First conditional for real future threats.
18. What would have helped you pass?
a) Working harder
b) Work harder
c) Worked harder
d) Works harder
Answer: a) Working harder
Explanation: Gerund (–ing form) is needed in this third conditional context.
19. What do you do if the computer crashes?
a) I will restart it
b) I restart it
c) I restarted it
d) I would restart it
Answer: b) I restart it
Explanation: Zero conditional for present routine actions.
20. What if he had listened to advice?
a) He succeeds
b) He succeeded
c) He would have succeeded
d) He would succeed
Answer: c) He would have succeeded
Explanation: Third conditional for imagining different past outcomes.