Modal

Modal verbs are used to express ideas such as possibility, intention, obligation and necessity. Example from modal like may, might, should, must, can, could, have to, has to

The formula that we can use:
Modal + V1 or Modal + be + adverb, noun, etc

Example in sentences:

1. May, might
   
   To express Possibility
   
   
   • I may stop teaching next year
   • Don't run, you may fall
   • It's cloudy
   • They may be at home at 5.30 P.M


2. Should
   
   To express about suggestion
   
   
   • Harry is sick. He is at hospital now. You should see him
   
   
   • It's cloudy. It might run. You should bring a rain coat
   
   


3. Must, have to, has to
   
   To express about compulsory
   
   
   • Your mom is at the hospital. She is sick. You must see her
   
   
   • Every student must not smoke at school
   
   
   • Every worker must do their duty
   
   


4. Can
   
   To express about ability
   
   
   • He can swim
   • They can play football
   • Can you make the table>
   • Can she drive?


5. Could
   
   To express about possibility (in positive sentences) and permission (in question sentences)
   
   
   • I could see you tonight
   • Could you give me any water, please?
   • Could I come with you?