Tenses >> Past continuous

Structure of past continuous
I was reading a book.	I wasn't (was not) reading.	Was I reading?
You were reading a book.	You weren't (were not) reading a book.	Were you reading a book?

Past continuous - common mistakes
Common mistakes	Correct version	Why?
I waiting for him almost two hours.	I was waiting for him almost two hours.	To form the past continuous we use was/were + ing.
What did he doing when you saw him?	What was he doing when you saw him?
We were playing tennis every morning.	We played tennis every morning.	We use the past simple for repeated actions in the past.
They watched TV when I came.	They were watching TV when I came.	We use the past continuous when we want to say what was happening (what was in progress) at a particular time in the past.

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