POSSIBILITY AND CERTAINTY. MAY, MIGHT AND COULD  We use may or might to say that something is possible or that it is quite likely. We can use them for.

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POSSIBILITY AND CERTAINTY

MAY, MIGHT AND COULD  We use may or might to say that something is possible or that it is quite likely. We can use them for the present or the future.  It may/might be a bomb. (= Perhaps it is a bomb.)  / may/might go to the disco tomorrow. (= Perhaps I will go to the disco.)

MAY, MIGHT AND COULD  We can use could to say that something is possible.  The story could be true, I suppose. (= Possibly it is true.)  You could win a million pounds! (= Possibly you will win a million pounds.)  Sometimes could means only a small possibility. It is possible (but not likely) that you will win a million pounds.  In some situations we can use may, might or could.  It may/might/could rain later.

MAY, MIGHT AND COULD  After may, might or could we can use a continuous form (be + an ing-form).  That man may/might be watching us. (= Perhaps he is watching us.)  Sarah may/might be working late tonight. (= Perhaps she will be working late.)  I'm not sure where Matthew is. He could be playing squash. (= Possibly he is playing squash.)

MAY, MIGHT AND COULD IN THE NEGATIVE  The negative forms are may not, might not/mightn't, and could not/couldn't.  MAY NOT AND MIGHT NOT - Something negative is possible.  Daniel may not get the job.  Tom might not be in.  I mightn't finish the marathon tomorrow. (It is possible that I will not finish it.)  COULDN’T - Something is impossible.  Vicky is afraid of heights. She couldn't climb onto the roof.  I'm completely unfit. I couldn't run a marathon. (It is impossible for me to run it.)

MUST AND CAN’T  MUST - We use must when we realize that something is certainly true.  She isn't answering the phone. She must be out.  I had my keys a moment ago. They must be here somewhere.  Andrew isn't here. He must be working in the library.

MUST AND CAN’T  CAN’T - We use can’t when we realize that something is certainly not true.  He can’t be her father, he’s too young.  She can’t be working. The shop closed a couple of hours ago.

MUST HAVE / CAN’T HAVE  These are used to make logical deductions about past actions.  I must have left my wallet in the car. (I am sure I did)  Jim can't have noticed you. (I am sure he didn't)

May have, might have and could have These express possibility or uncertainty about past actions.  Jean might have missed the train. (perhaps she did)  He may not have received the letter. (perhaps he didn't)  You could have been killed! (it was a possibility)

Was/Were to have  This describes something which was supposed to happen, but didn't. It is formal in use.  He was to have left yesterday. (he was supposed to leave, but he didn't)