strong obligation (imposed by yourself) - I must remember to phone Roger, strong obligation (no choice, imposed by someone else) - I have to be at work by 8 o’clock, necessity - I need to get some bread, recommendation / advice - You’re on a diet, you shouldn’t drink beer, obligation (it should be done) - It’s midnight! You’re supposed to be in bed!, warning about possible negative consequences - We’d better not eat it, it might be poisonous!, obligation (somebody forces you to do it) - Her teacher made her do some extra homework, permission (modal verb) - You can’t borrow my selfie stick, I need it today, permission in the past - I my last job I could arrive more or less when I wanted to., permission in particular situation (in the past) - I was allowed to go to stay up late last night., permission (expression) - My parents don’t let me watch that programme,

RFF - 5.2 - modals of obligation, necessity and permission

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