―I’m too tired. I want to give up.― If you don’t ________, you’ll win in the end.
Mary, come here at 7; if not , we shall go to the park ______ you
Nancy, are you sure you can do it by yourself — .I did it before.
He is talking so much about America as if he _____ there.
_________—No, they aren’t. They are my cousins.