Rewrite the sentence with the word in bracket: My advice is to go and see the doctor if your pain doesn't stop. (should)
You should go and see the doctor if your pain doesn't stop.
Rewrite the sentence with the word in bracket: If I were you, I'd take a week off>> you....(ought)
You ought to take a week off.
Rewrite the sentence with the word in bracket: I can't meet you tonight.>> I....(not be able to)
I won't (will not) be able to meet you tonight.