语法总结
must 表示推测和 have to 表示必须
She must be... 是对现在的推测；had/will have to 表示过去或将来的必要。
相似句：
- She must be tired.
- She had to wear a costume last year.
in spite of 后接名词或动名词
in spite of this 后接代词；它不能直接引导完整从句。
相似句：
- In spite of the rain, we went out.
- In spite of being tired, he worked on.