In grammar, "wouldn't" is a contraction of "would not." It is used to express a future or hypothetical action or situation that is unlikely or conditional.

There's no such thing as 'grammer'. If you mean 'grammar', it's generally a contraction of 'of'.

"It's" is a contraction of "it is" or "it has" in English grammar. It is used to combine the pronoun "it" with the verbs "is" or "has" to form a shorter, more informal expression.

No, it's a contraction of 'I would' and is a part of proper grammar.

A contraction in grammar is a shortened form of a word or group of words created by omitting one or more letters and replacing them with an apostrophe. For example, "can't" is a contraction of "cannot" and "she's" is a contraction of "she is." Contractions are commonly used in spoken and informal written English.