按要求改写句子。
1. Did you watch videos yesterday evening? (作肯定回答)
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2. There is an Australian teacher in our school this year. (用last year改写)
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3. He did his homework an hour ago. (改为一般疑问句，并作否定回答)
__________________________________________________________?
__________________________________________________________.
4. Ellen is going to clean the blackboard. (用often改写)
__________________________________________________________.
5. He cleaned the classroom and played football that afternoon. (改为否定句)
__________________________________________________________.
1.Yes, I did
2. There was an Australian teacher in our school last year
3. Did he do his homework an hour ago
No, he didn't
4. Ellen often cleans the blackboard
5. He didn't clean the blackboard and play football that afternoon