"I should have known better"

Revise Modal Verbs here

Some more exercises (Modal and Modal Perfect):
 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

Some music to learn Modal Perfects:

A very famous song back in the 1980's (for Romantics only):

"I should have known better" by Jim Diamond

and a classic...full of Modal Verbs: