It is not necessary for you to wait any longer --> need
You need not wait any longer.
You are required to respect the national flag. --> must
You must respect the national flag
She was able to read when she was three.
She could read when she was three
You are prohibited from entering my home. --> must
You must not enter my home
It’s possible that Jane will visit Switzerland next year. --> could
Jane could visit Switzerland next year.
I’m thinking about taking Spanish lessons. --> may
I may take Spanish lessons
It’s possible the weather will be sunny tomorrow. --> might
It might be sunny tomorrow
I'm sure she thinks I'm stupid. --> must
She must think (that) I'm stupid
They're always buying new cars. I'm certain they have a lot of money.--> must
They must have a lot of money
Perhaps she’s studying at the library. --> might
She might be studying at the library
