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“MAL”
ou
“MAU”?

Quando você não foi bem numa prova, você diz que foi "mau" ou "mal"? Vamos ajudar você a tirar essa dúvida 

mAU

É sempre adjetivo. Significa “ruim”, “imperfeito”, que causa prejuízos. É antônimo de “bom”.  O plural é “maus“” e o feminino
é “má”.

 MAU

Exemplo:
Aquele artista sempre fazia o papel de homem mau




mal

Pode ser advérbio de modo, quando significa “incorretamente”. Nesse caso, é invariável e seu antônimo é o advérbio bem. Como advérbio, refere-se sempre a um verbo ou substantivo.

Também pode ser substantivo, quando este significa “nocivo”,  ou sinônimo de “doença”.


Exemplo advérbio de modo:

Ela comia muito mal



Exemplo de substantivo: 

“Você é minha droga, paixão e carnaval; meu zen, meu bem, meu mal” (Caetano Veloso)


Há uma regrinha bem fácil e que você pode usar sempre, sem crise:

substitua “mal” por “bem”; 
e “mau” por “bom”.

O dilema desaparece quase como mágica, imediatamente.

Exemplos com "mal" e "bem":

Estou me sentindo mal essa manhã. (Estou me sentido bem essa manhã)

Fui muito mal no exame final. (Fui muito bem no exame final)



Exemplos mau e bom:

João é mau aluno. (João é bom aluno)

Ele foi muito mau comigo. (Ele foi muito bom comigo)

Português

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