Question 1

What is the difference between may and might?

Accepted Answer

Both "may" and "might" express possibility, and in most situations you can use either one: "It may rain" = "It might rain." The traditional rule is that "may" suggests a slightly higher chance (about 50%) and "might" suggests a slightly lower chance (about 30-40%), but this difference is very small in modern English. One clear difference: "may" is used for formal permission ("May I leave early?"), while "might" is not normally used this way. In the past tense, both "may have" and "might have" are used for guessing about what happened: "She may have forgotten" = "She might have forgotten." In conditional sentences (imaginary situations), prefer "might": "If I were rich, I might buy a yacht."

Question 2

What is the difference between "may not" and "might not"?

Accepted Answer

"May not" has two meanings depending on context. It can express prohibition — "You may not leave the room" means you are not allowed to leave. It can also express weak possibility — "It may not rain tomorrow" means perhaps it will not rain. "Might not" only expresses possibility: "It might not rain tomorrow" (perhaps it won't). The prohibition meaning of "may not" is more common in formal or written English, such as rules and official notices: "Visitors may not take photographs." If you see "may not" in a rule or instruction, it means "must not." In everyday speech, context makes the meaning clear. Exam tip: when a question asks about permission or prohibition, "may not" is the answer; for possibility, both "may not" and "might not" work.

Question 3

How do I use may and might for past possibility?

Accepted Answer

To talk about something that possibly happened in the past, use "may have" or "might have" + past participle: "She may have taken the wrong bus" (perhaps she did) or "They might have already eaten" (perhaps they did). The meaning is the same — you are guessing about something that happened before now. The negative form is "may not have" or "might not have": "He might not have received your message" (perhaps he did not get it). Do not confuse this with "must have" (strong deduction): "She must have left" (I am almost certain) is much stronger than "She may have left" (it is possible). This pattern appears regularly in B1 and B2 English exams.

May and Might Exercises

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