We can’t wear sandals at work. (not supposed)
We are not supposed to wear sandals at work. (strongest prohibition))
I have to take notes during meetings. (supposed)
I am supposed to take notes during meetings. (strongest obligation))
We shouldn’t eat at our desk. (not allowed)
We are not allowed to eat at our desk. (strongest prohibition)
You can give your feedback. (encouraged)
You are encouraged to give your feedback. (permission = most formal)
You’re required to wear a jacket at work. (should)
You should wear a jacket a work. (strongest obligation)
We’re allowed to work from home. (may)
We may work from home. (permission = most formal)
They don’t let us ask questions. (not supposed)
We are not supposed to ask questions. (strongest prohibition)
They make us use our own laptops. (required)
We are required to use our own laptop. (strongest obligation)