根据要求完成句子
1. He is too young to look after himself.(改为同义句)
He is not _______ _______ to look after himself.
2. My parents allow me to stay up until 9:30 pm. (改为同义句)
I _______ _______ to stay up until half _______ nine.
3. We can't decide when we should go to walk. (改为同义句)
We can't decide _______ _______ go to school.
4. He walked so fast that I couldn't follow him. (改为同义句)
He walked _______ fast _______ _______ _______ _______ him.
5. I have some ideas. It may help. (合并成一个句子)
I have some ideas ________ ________ help.