do, have and special verbs in the Past Progressive

How to use do and have in Past Progressive

Pronouns	Affirmative sentences	Negative sentences	Questions
I	I was doing an exercise.	I was not doing an exercise.	Was I doing an exercise?
you	You were doing an exercise.	You were not doing an exercise	Were you doing an exercise?
he, she, it	He was doing an exercise.	He was not doing an exercise.	Was he doing an exercise?
we, you, they	They were doing an exercise.	They were not doing an exercise.	Were they doing an exercise?

Pronouns	Affirmative sentences	Negative sentences	Questions
I	I was having a bath.	I was not having a bath.	Was I having a bath?
you	You were having a bath.	You were not having a bath.	Were you having a bath?
he, she, it	He was having a bath.	He was not having a bath.	Was he having a bath?
we, you, they	They were having a bath.	They were not having a bath.	Were they having a bath?

We often use the short/contracted forms with these verbs.