2a) PAST INDEFINITE
He wrote a letter.
They did not play match yesterday.
Did they go for a walk?
Int. & Neg.:Did+sub+not+V1
Did you not take your lunch?
2b) PAST CONTINUOUS
Gita was making tea.
You were not reading.
Int. : Was/Were+sub+V1+ing
Were they running?
Int. & Neg. : Was/Were+sub+not+V1+ing
Were children not taking bath?
2c) PAST PERFECT
We had watched TV.
The train had left by then.
I had not played.
Rakesh had not come for three months.
Had they won?
Int. & Neg.: Had+sub+not+V3
Had they not washed the clothes?
Note: Mostly the sentences are made in this tense when an action completed before a point of time in past: i) The guests had not reached till Sunday. ii) The movie had started before I reached home. iii) She had completed her work before 3pm.
2d) PAST PERFECT CONTINUOUS
She had been helping me for three years.
He had not been watching TV since noon.
Had they been gossiping for 2 hours?
Int. & Neg.: Had+sub+not+been+V1+ing+ since/for
Had you not been going to office for last two days?