根据要求完成下列句子.

问题描述:

根据要求完成下列句子.
1、They are enjoying tuemselves now.(改为同义句)
2、The children are having an art lesson at the moment.(改为否定句)
3、Betty is (eating an ice cream )now.[对括号里的提问)
4、They enjoy the school trip.(用now该写句子)

They are having a good time now.The children aren't having an art lesson at the moment.What is Betty doing now They are enjoying the school trip now .