"He should not come here again."

Translation: Ele não deveria vir aqui novamente.

[scotsgit]

what is difference between "ele deve" and "ele deveria" ?

[Paulenrique]

As a rule: dever = must (obligationl), deveria = should (suggestion, advice)

[ptackova]

So why "Ele não deveria vir aqui novamente" is wrong?

[Paulenrique]

that is also correct!