• Two Continuous Actions in the Past

• 
• Use the past continuous for two actions or events that are taking place at the same time in the past. You can use while or and to join the two actions.

  
  

  past continuous + while + past continuous

  -My son was reading while I was cooking.
  

  
  

  past continuous + , and + past continuous

  -John was decorating the house, and Mark was cleaning.*

  
  

  *Remember!  Use a comma (,) before and with two past continuous actions.
•  Click on the play button to hear the audio

• While Matt was exercising, Jo was washing dishes.*	Sam was getting a haircut, and I was shopping.
  What were you doing while I was reading?	I was watching the parade while you were reading.

• *Remember!  Use a comma (,) if the action with while comes first in the sentence.

Source : Alison