Q: If Nobody knew whether there was life on Mars because, oddly enough, nobody had looked until now., can we say that "If was unknown as whether their was life on Mars or not."?

A: yes

Q: If Five restaurants., can we say that "There are two restaurants."?

A: no

Q: If Let's get out of it." The girl assenting, they started walking down Dover Street towards Piccadilly., can we say that "The girl refused his advances and left on her own."?

A: no

Q: If that's not too old, can we say that "That isn't too young."?

A:
no