1.Can I help you？同义句 2.Must he eat up all the bread？改成否定句

1. = May I help you ? = What can I do for you ?

2. Must he eat up all the bread？
否定回答：No, he needn't .（千万不能用 No,he mustn't. ）
No, he doesnt have to .

1.What can I do for you?

2.反义疑问句:Mustn't he eat up all the bread?
否定句:He needn't eat up all the bread.

1、what can i do for you?

2、这是疑问句，不能改成否定句。你是不是想要反义疑问句？
mustn't he eat up all the bread?难道他绝不能吃完所有面包
否定句是陈述句 he mustn't eat up all the bread.他绝不能吃完所有面包。

May i help you?

he needn't eat up all the bread

no，kznk