Question

Change to negative form:
a-) I have already been in the United States
b-) They have already bought the vegetables
c-) Jane has already cooked the meat
d-) I have already studied my lessons
e-) I have already seen that film

Answer 1

a) I haven't been in the United States yet b) They haven't bought the vegetables yet c) Jane haven't cooked the meat yet d) I haven't studied my lessons yet e) I haven't seen that film yet