一：有关英语作文的问题
1。If I were you, I would …，虚拟语气，如果我是你，我会……，比较委婉地表达自己的建议
2.You are supposed to do 你应该/必须做某事
3. you'd better do sth. 最好做某事
4. You ought to do sth. 情态动词，搐做某事是你的职责或你应尽的义务。
5.It's your obligation to do sth. 个人觉得和前一个意思差不多。
希望有所帮助。
二：英语作文问题
Welcome to our school library.
Our school library was built in 1998, more than 5000 of the books here.
Our teachers and students love to come to the library to read a book.
However, in the library, you need to follow some rules.
First, you can't speak loudly in the library. This will disturb others.
Second, you can not on the book scribbles.
Third, you can't take the book out, unless you have been allowed to librarian.
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