Bonjour
EXO 4
a- He would be captivated if he saw an UFO. (peu probable)
b- If I met extraterrestrials, I would learn their language. (peu probable)
c- You will come with me if I watch the sci-fi film. (probable)
d- Of course we will come with you, if you invite us for a visit of you rocket. (probable)
if + present ---------> futur (probable)
if + past simple -------> conditional present (peu probable)
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EXO 5
1- He won't write another science fiction novel unless his firdt book is a success.
2- You won't believe in UFOs unless you see one.
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bonne journée ☺☺☺