Were: you were eating a sandwich yesterday
was: i was playing with my friend yesterday
are: we are a family / we are watching tv
1 5 1
I was really busy yesterday 
they were not abroad last year
we are here
was dan were adalah tobe bentuk past. was digunakan bila subject-nya I, she, he, dan it. misalnya she was cooking in the kitchen yesterday, were digunakan bila subject-nya they, you dan we. misalnya you were very beautifull last night. sedangkan are merupakan bentuk tobe present untuk you, they, dan we.misal. they are friends
was:tobe past tense