English Grammar | Preterite: BE + -ING | Main use: action in the past, which was being done, when another short action interrupted it.
Syntax: auxiliary BE (was/were) + Verb + -ING
Examples:
Were they playing football when you saw them yesterday?
Answers:
Yes, they were playing football when I saw them yesterday.
= Yes, they were.
No, they weren't playing football when I saw them yesterday.
= No, they weren't.
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