B1-B2 :MODAL VERBS: abilities, obligation/lack of obligation, deduction, advice.

INTERMEDIATE LEVEL B1+ B2.1
Modal verbs are used to express abilities, obligation, deduction, prohibition, etc.
Here are some links which explain  the different uses of modal verbs.

• ABILITIES: TALKING ABOUT ABILITIES IN THE PRESENT, PAST, FUTURE . BE ABLE TO.
• ABILITIES EASY EXPLANATION. 
• OBLIGATION: HAVE TO AND MUST 'OBLIGATION'

OTHER USES: ability, permission, requests, advice

• MIXED ACTIVITIES: MODAL VERBS.

Watch the video: 

• DEDUCTION: Follow the lesson here: MODALS OF DEDUCTION: must, might, could, can't be..

• PRACTICE: have to, don't have to, can, can't, should, shouldn't. ( obligation, necessity, lack of necessity).

ONLY FOR ADVANCED LEVELS B2.2 AND C1
ADVANCED LEVEL- C1
B2.2- C1: modal verbs in the past: must have, might have, could have, etc.