Past continuous

The past continuous (also called past progressive) is one of the continuous verb forms in English. (The continuous forms are: present continuous, past continuous, and future continuous). The past continuous tense mainly describes actions that are in progress at a particular time in the past time frame. 
Forms.
Affirmative sentences.
Affirmative sentences in the past continuous are formed using verb be (was / were) + base verb -ing. 
Negative sentences.
Negative sentences are formed by adding not (or the short form n't) to the past tense of the verb be.
Questions.
Yes/no question are formed using the past form of the verb be (was / were) + subject + base verb-ing.
Wh-questions begin with one of the wh-question words. (Wh-question words are: what, where, when, why, who, which, whose, how.)