What is Past continuous tense?

*The simple past continuous is used to denote an action going on at some time in the past. The time of the action may or may not be indicated.

We were listening to the radio all evening.

It was getting darker.

The light was out while I was reading.

When I saw him, he was playing chess.

As in the last two examples above, the Past Continuous and Simple Past were used together when a new action happened in the middle of a longer action. The Simple Past is used for the new action.

*This tense is also used with always, continually etc. For persistent habits in the past.

He was always grumbling.

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