Unit 23: PAST CONTINUOUS
This formation usually means 'past -- for a limited period of time'. We use the past tense of the auxiliary verb be (Unit 17) before the -ing form of the lexical verb (Unit 3).
Formation (be + -ing form)
STATEMENTS
EXAMPLES:
I was working all yesterday morning.
He wasn't doing anything.
The climate was changing at the time.
They were not enjoying themselves.
QUESTIONS
EXAMPLES: 
What were you doing at 9:45 last night?
Where was he going?
Who was helping him?
NOTICE: For spelling problems with the -ing form of the verb, look at Appendix 6.
Use
PAST ACTIVITY OR TEMPORARY HABIT
EXAMPLES:
Between 10 and 11 last night, I was reading. 
They were getting up early that month. 
BACKGROUND ACTIVITY IN THE PAST
EXAMPLES:
She was welding a pipe when the phone rang. 
By the time they reached the pipeline, the surveyors were already finishing their last shots.
ARRANGEMENTS IN THE PAST
EXAMPLE: Everybody was excited because they were leaving for home the next day.
NOTICE: 
Past continuous or past simple? (Unit 40)
Past continuous or used to? (Unit 40) 
 



