Past Progressive Tense review

How do you form the past progressive tense?. Be in the present (am, is, are) + a verb. Be in the past tense (was, were) + a verb. Be in the present tense (am, is, are) + a verb + -ing ending. Be in the past tense (was, were) + a verb + -ing ending.

We use ________________ pronouns with ____________ form (of the verb to be). you, we, they. I, he, she, it.

Ordene la frase correctamente: were/in the supermarket/shopping/They. the supermarket" "They were shopping in.

"An action in progress during a time in the past" is what the past progressive means, Yes or No?.