F5. can use ‘should’ after a number of adjectives, especially: strange, odd, funny, typical, natural, interesting, surprised, surprising. (e.g. It's strange that he should be late. He's usually on time)
F6. can say 'If something should happen ~’. (e.g. If Tom should phone while I'm out, tell him I'll call him back later.)
a. can also begin with should. (e.g. Should Tom phone, tell him I'll call him back later)
F7. can use I should ~ / I shouldn't ~ to give somebody advice. (e.g. Shall I leave now? No, I should wait a bit longer. Here, I should wait = I would wait if I were you, I advise you to wait.)
Idiom 365
Know the Ropes: to have a knowledge or experience how to do
Example: Anybody who has been doing or seeing the job for a few days should know the ropes.