Definition:
'won't' is a contraction of 'will not.' As an auxiliary verb, it is used to indicate a future action that someone is unwilling to perform or a future event that is not expected to happen. It can also express a strong determination not to do something.
Rules:
'won't' is used to form the negative of the future tense with 'will.' It can also be used to make predictions about the future. Additionally, 'won't' can express refusal or a strong determination.
Examples:
I won't be attending the meeting tomorrow.
It won't rain today; the sky is clear.
She won't listen to any excuses.
Tips:
'won't' is the negative form of 'will,' so ensure the context requires a negative expression. It's a common mistake to use 'won't' when expressing a lack of ability. For ability, 'can't' (cannot) should be used. For example, 'I can't swim' (not 'I won't swim') unless you're expressing a refusal to swim. In older English and in some dialects, 'won't' was sometimes used as a contraction for 'want.' However, in modern standard English, this usage is considered archaic or nonstandard.