What is past continuous tense

The past continuous is formed from the past tense of "to be" with the base of the main verb plus the ending "-ing" form of the verb. ... The past continuous tense is "was watching." Another example of this tense is: We were playing football when he sprained his wrist last week. The past continuous tense is "were playing."

Explanation:

The past continuous describes actions or events in a time before now, which began in the past and were still going on when another event occurred.

hope this helps!!