These are modal verbs. Your grammar book certainly covers them. If you don't have a grammar book, I recommend the famous text book English Grammar in Use with answers by Raymond Murphy which can be used for independent study or for reference.

Good evening from the Philippines Ma'am Grace! May, might, could are modals of possibility. "Will" is used to talk about the future. "Would" is the past tense of "will". It is also used to ask for something. "Shall" is used for making suggestions. :) :) :)

你好 Grace! 👋🏻 I have been teaching Chinese children online over the past two years. If you would like your child to focus on these words, I can design a special lesson to review this vocabulary. Let me know if you have any questions 😊

Hello Ma'am Grace! I would like to help your child to know the difference of that modal verbs. You can visit my profile and book a lesson with me. Thank you! 😊