You shouldn't smoke. It's bad for you.
----- I go to the toilet?
You ----- play with that! It's dangerous.
It ----- could get much colder in December.
I ----- could lend you my notebook.
I ----- speak English
It ----- be Susan. She is in India.
He ----- speak French, but now he forgot.
Oh, it's very cold in here. I'll close the window.
----- I go to the cinema with you?
spontaneous decision (will)
past ability (could)
permission (may)
probalility (could)
ability (can)
request/offer (could)
prohibition (musn't)
permission (can)
probability (0%)
advice (shouldn't)
