Be 动词否定句以及缩写They _ elephants.They are elephants.It _ a cat. It is a cat.They _ swimming.They are swimming.She _ cute. She is cute.Do it!They are elephants.It is a cat.They are swimming.She is cute.They are not elephants.It is not a cat.They are not swimming.She is not cute.变否定句They are not elephants.It is not a cat.They are not swimming.She is not cute.They are elephants.It is a cat.They are swimming.She is cute.Be 动词后面+not ，be+not.1. I _ from Australia. 1. I _ from Australia.2. She _ a student.
