(page 3)

Modal Verbs - (ALL MODALS)
source: Anglo-Link           2018年3月19日
'can' or 'could'? 'may' or 'might'? 'shall' or 'should'? 'must' or 'have to'? In this lesson, we're going to review the usage of all English modal verbs to improve your conversation skills.

Fixed Modal Expressions
source: Learn English with Alex [engVid]         2018年3月21日
do the quiz at https://www.engvid.com/fixed-modal-ex...
"Fixed" means that they do not change. You just use the whole sentence without changing it. The fixed modal expressions covered in this video include: "You can say that again", "I couldn't help it", "I would if I could", "You would've loved it", "You shouldn't have", and more!