Question

quiero saber cuando se usa "were" o "was"

there______only three rugs.

Answer 1

Usamos el there WAS uando se refiere a solo una cosa (! manzana...) o la cosa que no se puede contar (agua, leche...)Y usamos there were cuando se refiere a una cosa que se puede contar ( 3 manzanas, 2 gomas,...)

En tu caso como el 3 rugs se puede contar,va were entonces;

There WERE only three rugs.