Grammar Notes: Future possibility
Read how these modals change the meaning of certainty, then try the activities.
1. Fairly certain about the future
Use will or won’t (will not) when you want to say you are reasonably sure about a future situation or result.
Example: If we cut emissions sharply, air quality will improve. If we ignore the problem, it won’t disappear on its own.
2. Uncertain — possibilities
Could, might, and may all mean the future is open: more than one outcome is possible.
Example: New technology might reduce waste. Costs could fall later. The plan may need more funding.
3. Uncertain — “perhaps not”
Use might not to say you are not sure something will happen. Do not use could not for this meaning.
Example: The species might not survive if the habitat shrinks.
4. Verb form after the modal
After a modal, use the base form of the verb (no to before the main verb).
Example: Desert farms could become an important source of food. (Not could to become.)