Respostas

2013-12-06T14:29:14-02:00
Was é usado quando o sujeito está no singular(I,he,she, It), were é usado quando está no plural(You, we, they).
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2013-12-06T14:39:22-02:00
Was se usa que para o singular no passado: I was, She was, It was, etc

O were se usa para o plural no passado: We were, They were, You were
mas para perguntar se usa a Did, e para negar tbm
Ex.: Did Lucas play video game yesterday?
Lucas didn't play video game yesterday