Question

dave wasn't /weren't tired yesterday ​

Answer 1

Respuesta:

Dave wasn't  tired yesterday ​

Explicación: usas was con i, she, he, it

y were con: they, we

Answer 2

I'm going to help you.

Dave wasn't tired yesterday

Dave no estuvo cansado ayer

Recordemos que cuando hablamos en tercera persona (He, She, It) usaremos was

The limits of your language are the limits of your world.