Modal verbs

http://www.ego4u.com/en/cram-up/grammar/modal-verbs
http://www.englishpage.com/modals/modalintro.html

I've learned that in this pages you've got all the imformation that you need in a very small page, beacuse it's very easy to learn it with this type of pages.
The irregular verbs are the verbs that helps us to express wishes, permission, etc.
The common ones are:

Can Could May Might Must

Shall Should Will Would

I've learned the persons in this verbs, the different modal verbs, why we need them, etc.