sb used to do sth.它的否定形式是什么?

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其否定形式有两种,可以用didn't也可以用not:
1, He didn't use to get up early when he was young.
2, He usedn't to get up early when he was young.
3, There used to be a meeting on Monday, didn't there?
4, There used to be a meeting on Monday, usedn't there?

sb used to do sth.它的否定形式是什么? used to do sth的疑问形式和否定形式 be used to do sth.否定形式是什么? used sb to do sth?的肯定回答和否定回答是什么?例如,used lily to walk to scho 为什么ask sb to do sth的否定形式是ask sb not to do sth allow sb to do sth 的否定形式 Ought sb. to do sth.?的肯否回答 Used sb. to do sth.?的肯否定回答. used sb.to do sth.的回答 used sb to do sth?的肯定回答和否定回答 1.want sb to do sth 否定形式? enough to do sth的否定形式是什么? dare to do sth的否定形式是什么