Expressing Possibility: May, Might, Could, and Can

In English, we use modal verbs to talk about how likely or possible an event is. The modal verb we choose depends on whether the possibility is general, theoretical, strong, or weak.

1. Present and Future Possibility

To express that something is possible now or will be possible in the future, we use may, might, could, and can.

A. May (Stronger Possibility: ~50% Chance)

Use: Expresses a realistic, factual possibility.
Example: The sky is cloudy; it may rain this afternoon.
Example: She may join us later, but she is busy right now.

B. Might (Weaker Possibility: ~30% Chance)

Use: Expresses a more tentative, doubtful, or hypothetical possibility. It is weaker than may.
Example: I might travel to France next year if I save enough money.
Example: He might know the answer, but I doubt it.

C. Could (Theoretical Possibility: ~30% Chance)

Use: Expresses that something is theoretically possible but not necessarily happening.
Example: We could go to the beach today, or we could stay home.
Example: The project could be finished by Monday if we work overtime.

D. Can (General / General Truth Possibility)

Use: Expresses that something is generally possible as a fact, or that a situation is occasionally true.
Example: The weather in England can be very unpredictable. (It is generally known to happen).
Example: High stress can cause health problems.

2. Past Possibility: May Have, Might Have, and Could Have

To talk about possibilities in the past, we combine the modal verb with have and Verb 3 (Past Participle).

Structure: `Subject + may/might/could + have + Verb 3`

Use: Expresses speculation about past events where we do not know the facts.
Example: She is late. She may have missed the train. (It is possible she missed it).
Example: They might have forgotten about the meeting.
Example: You could have hurt yourself jumping off that wall. (It was possible, but fortunately you did not).

3. Summary of Certainty and Possibility

Modal	Degree of Possibility	Context	Example
Can	General Possibility	Known general facts	Winters here can be cold.
May	Strong Possibility	Specific realistic situations	It may snow tonight.
Could	Weak/Theoretical	Options or ideas	We could try another way.
Might	Weak Possibility	Tentative/Doubtful chance	She might come to the party.

Next, we will explore Logical Deduction & Certainty to learn how to express when we are almost 100% sure about a fact.

1. Present and Future Possibility#