If it ain’t broke, don’t fix it.

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Jack Scholes

If it ain’t broke, don’t fix it.

Bert Lance

This statement has become a fixed informal saying in English, which you use when you want to say that if something works well enough, or is in a satisfactory state, there is no reason to try and change it.

Ain’t

Ain’t was originally used in England as the standard contraction of “am not”. It became non-standard in the early 19th century when people began to use it incorrectly as a contraction for “is not” and “are not” as well as “am not.” Nowadays it is widely used informally or humorously, as a contraction for:

• am not
• is not
• are not
• has not
• have not

Cf. Vocabulário: AIN’T
Cf. Contrações

Ain’t is also often used with two or more negatives, but with a single negative meaning.

• She ain’t goin’ nowhere. ( = She isn’t going anywhere.)
• I ain’t never done nothin’ to nobody. ( = I’ve never done anything to anybody.)

Innit (UK – slang)

In British English innit is used as a contraction for “isn’t it”, and is often used as a question tag at the end of a statement for emphasis.

• Great party, innit?

Cf. Como traduzir “INNIT?” para português?
Cf. Mais Frases Célebres

Referência: “Gems of Wisdom – Inspirational Messages to Enhance the Quality of Your Life and Improve Your English” de Jack Scholes – Disal Editora, 2007. Leia a resenha.