'wouldn't' is a contraction of 'would not'. As an auxiliary verb, it is used to indicate a conditional mood or a past of 'will'. It can also be used to express a polite request, offer, or invitation.
'wouldn't' is often used to form negative conditional statements. It can also be used to express a strong assumption or presumption about the past. Additionally, 'wouldn't' can be used to make polite suggestions.
I wouldn't go there if I were you.
She wouldn't have said that without a good reason.
Wouldn't it be lovely to take a walk in the park?
'wouldn't' is the negative form of 'would,' so it's essential to ensure that the context requires a negative expression. Avoid double negatives. For instance, 'I wouldn't never do that' is incorrect. Instead, say 'I would never do that.' Remember that 'wouldn't' can also be used in questions to make polite suggestions or to express surprise 'Wouldn't you like some tea?'