past continuous

The past continuous is formed from the past tense of be with the -ing form of the verb:

We use the past continuous to talk about the past:

• for something which continued before and after another action:

The children were doing their homework when I got home.

Compare:

I got home. The children did their homework.
and
The children did their homework when I got home.

As I was watching television the telephone rang.

This use of the past continuous is very common at the beginning of a story:

The other day I was waiting for a bus when …
Last week as I was driving to work … 

• for something that happened before and after a particular time:

It was eight o’clock. I was writing a letter.

Compare:

At eight o’clock I wrote some letters.

In July she was working in McDonald’s.

• .to show that something continued for some time:

My head was aching.
Everyone was shouting.

• for something that was happening again and again:

I was practising every day, three times a day.
They were meeting secretly after school.
They were always quarrelling.

• with verbs which show change or growth:

The children were growing up quickly.
Her English was improving.
My hair was going grey.
The town was changing quickly.