Freeze vs. frozen

[Mahesh.N]

Test No. incompl/elem-14 "Computers", question 6

Well, take the times when everything ..........

(a) frozen
(b) freezing
(c) freezes
(d) frees

Test No. incompl/elem-14 "Computers", answer 6

Well, take the times when everything freezes.

Correct answer: (c) freezes

Your answer was: incorrect
Well, take the times when everything frozen.
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May I know why it is freezes?

[Mister Micawber]

.
It freezes because it is very cold. Your choice, frozen, is the past participle, which requires assistance from is (is frozen) or has (has frozen) to become a complete verb phrase.
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber