Resposta :
a) A: They have studied English.
N: They haven't studied English.
I: Have they studied English?
b) A: It has changed since October.
N: It hasn't changed since October.
I: Has it changed since October?
c) A: Clark has seen Melinda lately.
N: Clark hasn't seen Melinda lately.
I: Has Clark seen Melinda lately?
d) A: I have done a lot of things today.
N: I haven't done a lot of things today.
I: Have i done a lot of things today?
e) A: I have known Susan for 10 years.
N: I haven't known Susan for 10 years.
I: Have i known Susan for 10 years?
f) A: He has followed my page for a long time.
N: He hasn't followed my page for a long time.
I: Has he followed my page for a long time?
g) A: Sam has used Facebook since i know her.
N: Sam hasn't used Facebook since i know her.
I: Has Sam used Facebook since i know her?
Espero ter ajudado, bons estudos! ;)