Formula, Structure, and Rules of Past Continuous Tenses

Formula:

Subject + was/were or was/were + Not + 1^st form of (verb) + ing + object.

Examples:

Subject	Verb	Object
He	Going	Museum

2. He was waiting for you.

Subject	Verb	Object
He	Waiting	You

3. The dog was barking at him.

Subject	Verb	Object
The dog	Barking	Him

4. I was driving his car.

Subject	Verb	Object
I	Driving	Car

5. He was writing a letter.

Subject	Verb	Object
He	Writing	Letter