I don’t have to introduce him to you        you know the boy.

My Chinese teacher is very knowledgeable        she reads lots of books.

       you do, don’t miss this exhibition, for it’s so hard for me to get the tickets.

        our teacher is ill,         he still comes to school to work.

—I want to know if Lucy        us in the fashion show tonight.
—I believe if she        her homework, she will join us.

—Look! Some people are running the red lights.
—We should wait        others are breaking the rule.

—Hey, man. You can’t cross the street now. You have to wait        the traffic lights turn green.
—Oh, sorry and thank you.

If we        take environmental problems seriously, the earth        worse and worse.

       you don’t give up, your dreams will come true.

My father was preparing for his speech         my mother was doing some washing last night.