causaient, *were chatting

1. 17. sortie. Notice the plural to agrée with the subject nous» This is the rule when the verb is conjugated with être,

1. 18. séparée. Notice the plural to agrée with the direct object, les, which cornes before the verb, This is the rule when a verb is conjugated with avoir. But, if the direct object follows the verb, the past part, remains unchanged.