Obligations and Prohibitions
<div>YOU MUST/HAVE TO...</div><div><br></div>
<div>YOU MUTN'T</div><div><br></div>
<div>YOU DON' T HAVE TO...</div><div><br></div><div><br></div>
es.slideshare.net For intermediate efl students. Watch the presentation and make sentences.
www.eslvideo.com The rules on mobile phone use.
www.perfect-english-grammar.com English grammar exercise about modal verbs of obligation

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