To be is the most common verb in the English language. It can be used as an auxiliary or a main verb. In the simple past tense, to be is conjugated as follows:

Singular = 1 Plural = 1+
I was You were
You were We were
He/she/it was They were

Uses

Was/Were

Question ? Positive Statement +
Negative Statement -
  Singular Written Form or spoken for emphasis
Written Form or spoken for emphasis
Contracted
Form (spoken)
sound
sound
sound
  Plural
sound
sound
sound

Examples

Were Was
Question - ? "Were you busy on Monday?" "Was it nice at the weekend?"
Positive Answer + Yes "Yes we were." "Yes it was. It was lovely."
Negative Answer - No "No we weren't." "No it wasn't. It wasn't very nice at all."

Want to know more about the use of verbs? Read our recommended grammar books section.

Forms of the verb "To be"