Real English 42 was/were Were you good at school?
Introduction to the simple past of "be": Was and Were

Real English Clip Q (82a) Second Language Series # 3
Ernie and Eric are world War II reenactors. Ernie's parents are Cuban but his first language is English. Eric's native language is also English, and he learned Spanish in Spain in perfect circumstances.

Real English Lesson 10 The Jones Family CC Double
For beginners: "is", "are" and adjectives.