Amigo que no aporta y cuchillo que no corta, aunque se pierda no importa

Amigo que no aporta y cuchillo que no corta, aunque se pierda no importa
 

I thinks it doesn´t need an explanation.
In English?

There must be one, but I can't think what. The nearest at the moment is

Good riddance to bad rubbish

By the way:
I thinks it doesn´t need an explanation.:bad:
Far more common is
I don't think it needs an explanation :good:

Similarly
I think I can't see you tomorrow. :bad:
I don't think I can see you tomorrow. :good:

We say both:

No creo que pueda verte mañana.
Creo que no podré verte mañana.

No creo que exista. Tengo dudas, pero me parece que no existe (subjuntivo).
Creo que no existe. Esoy muy convencido de que no existe.

Es más educado decir:

No creo que pueda verte mañana.

:)

Although the context would make it clear, could that not also mean

I don't think he/she will be able to see you tomorrow. :rolleyes:?

(Sorry Robin - we have highjacked your thread)

In English, there is a related rhetorical phrase: With friends like that, who needs enemies.

De acuerdo con Irma. Pequeños matices del idioma

Yes, it also means that. If we believe there's confusion, we use the pronoun. However, if the subject of both verbs is the same, we usually don't use a pronoun for the second verb. However, there's no rule of thumb.

Same as in Spanish: "Con amigos así, quién necesita enemigos" or "Con amigos así no necesitas enemigos".

L.A.