---Do you have to go now?---No,__I don't_____.
---Must she go to the shop?---No,_she needn't______.
---Does he have to decide immediately?---No,_he doesn't______.
---Did you have to take a taxi?---No,__I didn't_____.
---Must you wait for her?---No,__I needn't_____.
回答 must 的问题,不能用 mustn't,因为那个表示禁止