侃哥侃英语 . 全网“侃哥侃英语”博主. 在英语里，“be to do”这个结构有两种语法意义：. 1.连系动词be+动词不定式做表语。. 例如：. The mission is to find the …
Updated on December 14, 2022 Grammar Tips. The irregular verb to be is the most complicated of all the English verbs—and it just so happens …
modals. obligation. BE TO. Be + to -infinitive is used to express: official arrangements: The Prime Minister is to visit India next month. …
更多内容请点击：【干货17】一个被忽视的重要句型：be to do！ - 知乎