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Probabilities

100% SURE
(For sure)
Use Simple Present Tense
 Jack is hungry. He told me that he is hungry,
so I know that he is hungry. I'm 100% sure.
95% SURE
(Probably)
Use MUST
 Peter ate all of his dinner, then he ate the rest of my dinner too.
He must be really hungry today!
50% SURE, or Less
(Maybe)
Use may/might/could
 Frank hasn't eaten anything since 9 o'clock. It's noon now.
He might be hungry. He may be hungry. He could be hungry.

Click on QUESTION to test yourself.
 100% SURE: 
IS/ARE
  95% SURE: 
MUST
 50% SURE:
 MAY/MIGHT/COULD 
    		   

Score:

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