A. Did you read
B. Had you read
C. Have you read
D. Do you read
A. has not eaten
B. did not eat
C. is not eating
D. does not eat
A. had been/come
B. have been/came
C. were/came
D. are/came
A. existed
B. are existing
C. have existed
D. exist
A. knew
B. had known
C. have existed
D. exist
A. worked
B. has worked
C. was working
D. had been worked
A. begins/ends
B. had begun/ended
C. has begun/had ended
D. began/ended
A. waited/noticed
B. was waiting/noticed
C. waited/was noticing
D. was waiting/had noticed
A. turn
B. are turning
C. have turned
D. turned
A. has never won
B. had never been winning
C. is never winning
D. had never won
A. teach
B. teaches
C. to teach
D. teaching
A. you go
B. going
C. to going
D. to go
A. is not old enough
B. was not old enough
C. is not enough old
D. was not enough old
A. very old
B. too old
C. old enough
D. enough old
A. have found
B. found
C. haven't found
D. hasn't found
A. was trying
B. have tried
C. has tried
D. tried
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