英语高手进!（要有答题理由,回答好加分） 谢谢啦! 在线等!

英语高手进!（要有答题理由,回答好加分） 谢谢啦! 在线等!
改变句型：Mrs.White told Tim that he mustn't throw paper on the ground.（改为简单句）
Mrs.White told Tim _____ _____ throw paper on the ground.
The boy forgot when he should take the medicine.（改为简单句）
The boy forgot _____ _____ take the medicine.
I don't want to travel by ferry any longer.（保持句意不变）
I _____ _____ want to travel by ferry.
Mum didn't say anything after hearing the news.（保持原意）
Mum __________ after hearing the news.