英语改否定和肯定怎么改?

题目

英语改否定和肯定怎么改?
5小时之内必须回答
Ed smith has a great sports
collection.He has 8 tennis rackets,9 basketballs,and 7 baseballs.He has 3 soccer balls and 5 volleyballs.but he doesn't play sports —he only watches then on TV!

答案

be句型的
am是肯定 否定是am not
is是肯定 否定是is not缩写isn't
are是肯定 否定是are not缩写aren't