Question

negativo e interrogativo

Answer 1

1)
a) The moon has been a mystery to men.
b) Meteors have crashed against the surface of the moon.
c) The scientist has proved his theory.
d) They have found a new form of radiation.
e) I have studied English since 2010.
f) The teacher has given us the explanation about Present Perfect.
g) We have done exercises.
h) My cell phone has disappeared from my bag.
i) Carol has found my cell phone.

2)
a) Has the moon been a mystery to men?
b) Have meteors crashed against the surface of the moon?
c) Has the scientist proved his theory?
d) Have they found a new form of radiation?
e) Have I studied English since 2010?

3)
f) The teacher hasn't given us the explanation about Present Perfect.
g) We haven't done exercises.
h) My cell phone hasn't disappeared from my bag.
i) Carol hasn't found my cell phone.