Modals - obligation and recommendation

Modals are essential in English, particularly in business. They help you express whether something is needed, not needed, recommended or suggested.

Read an explanation of some of these modals here and also the use of shall for offers.

Some exercises:
http://www.englishgrammarsecrets.com/musthaveto/menu.php
http://www.englishgrammarsecrets.com/should/menu.php

http://www.englishgrammarsecrets.com/should2/menu.php
http://www.englishgrammarsecrets.com/shall/menu.php