Modals: should for advice or recommendation, have to for responsibility and must for obligation, only in simple present tense.  It's a grammar guide to explain elementary students modals by the first time.

modals-should-have-to-and-must-advise-responsibili-grammar-guides_125066.ppt

Modals: should, have to and must (advise, responsibility and obligation)

modals-should-have-to-and-must-advise-responsibility-and-obligation

Let's do English ESL grammar guide. Modals: should for advice or recommendation, have to for responsibility and must for obligation, only in simple present tens…