分类：教育/科学-外语学习
问题：英语作业？助动词误用Musthehavesaidsotheday 
助动词误用Must he have said so the day before yesterdayI will li to go swimming with you this afternoon.A: Must I go? B: No, you mustn't.He used to calling on me on Sundays
回答：Has he said so the day before yesterday
I like to go swimming with you this afternoon.
A: Must I go? B: No, you needn't.
He used to call on me on Sundays