A. forget
B. forgot
C. forgotten
D. forgetting
A. start
B. starts
C. started
D. will start
A. write
B. wrote
C. written
D. writing
A. is
B. are
C. was
D. be
A. go
B. goes
C. went
D. going
A. teach
B. teaches
C. taught
D. teaching
A. learn
B. learned
C. have learned
D. learning
A. do
B. does
C. is doing
D. did
A. is
B. are
C. was
D. be
A. have
B. has
C. had
D. was