The document provides examples of interrogative sentences asking what someone was doing at a specific time in the past. It shows interrogative sentences can begin with "Was" or "Were" followed by a subject and verb+ing to inquire about an activity in the past tense. The document also provides response examples answering the interrogative sentences with "Yes" or "No" depending on if the activity was happening or not.

1. INTERROGATIVE
What was she doing yesterday evening?

2. INTERROGATIVE
Was
I
She
He
It Verb
ing
Were
We
You
They

3. EXAMPLES :
Was she reading her English book yesterday evening
Were they reading their History book yesterday evening
Yes, I
she
he
It
was.
No, wasn’t.
Yes,
No,
we
you
they
were
weren’t.