The document provides examples of verbs in the past continuous tense and asks the reader to choose the correct verb form for different subjects and activities that were occurring in the past. It gives sentences with singular subjects like "Billy" and "Sandra" paired with verbs ending in "-ing" to indicate the past continuous tense was being used. For plural subjects like "They", "Anna and Robert", and "Ben and Sara", it pairs them with verbs in the past continuous as well to show this tense can be used for both singular and plural subjects when describing ongoing past activities.