"Could" and "might" are both used to talk about things that are possible, but they suggest different levels of certainty or different types of possibility.
Could
"Could" has a few main uses related to possibility:
-
General Possibility / Ability in the Past:
- It talks about something that was possible or someone had the ability to do in the past.
- Example: "When I was younger, I could run very fast." (ability in the past)
- Example: "It could rain yesterday, but it stayed sunny." (possibility in the past, but didn’t happen)
-
Weak or Remote Possibility (in the Present/Future):
- It suggests a possibility, but perhaps one that is less likely or more uncertain than "may" or "might."
- Example: "The meeting could be delayed." (It’s possible, but not definite.)
- Example: "We could go for coffee later, if you’re free." (Suggesting an idea, a possibility.)
-
Suggestion or Request (Polite):
- "Could" is often used to make polite suggestions or requests.
- Example: "We could try a different approach."
- Example: "Could you please pass me the salt?"
Might
"Might" is primarily used for:
-
Weak or Remote Possibility (in the Present/Future):
- Similar to "could," "might" expresses a possibility, often a bit weaker or more uncertain.
- Example: "I might visit my family next weekend." (It’s possible, but I haven’t decided.)
- Example: "It might snow tonight, but the forecast is unclear." (Low possibility.)
-
Speculation or Guess (about the Present/Future):
- Used when you are guessing about something possible but without strong evidence.
- Example: "He’s not answering his phone. He might be in a meeting."
- Example: "They might agree to our terms, but we’ll see."
Key Differences & Nuances
When talking about possibility in the present/future, consider these shades of meaning:
| Feature |
Could |
Might |
| Certainty |
Slightly stronger possibility or general capability. |
Weaker or more uncertain possibility. |
| Feeling |
"It is possible." |
"Perhaps; a small chance." |
| Use Case |
Suggestions, past ability, or general possible outcomes. |
Speculation, expressing a slight chance. |
| Example |
"I could go to the party."
(I have the option/ability.) |
"I might go to the party."
(It’s possible but less certain.) |
Direct Comparison
"It could rain tomorrow."
This means it’s possible for rain to happen.
"It might rain tomorrow."
This also means it’s possible, but it sounds more tentative.
In everyday conversation, they can often be used interchangeably, but choosing the right one lets you be more precise.