A. help
B. helped
C. helping
D. helps

A. lose
B. lost
C. losing
D. loses

A. have
B. are having
C. had
D. has

A. lives
B. lived
C. has lived
D. is living

A. is
B. are
C. were
D. be

A. tries
B. try
C. tried
D. trying

A. is
B. are
C. was
D. were

A. has
B. have 
C. had
D. was

A. sings
B. sang
C. sung
D. singing

A. leave
B. leaves
C. left
D. leaving