Grammar_Verbs - Past Simple versus Past Continuous

I was having a bath when the telephone rang.
  Past Continuous                                    Past Simple

An action (Past Simple) in the past disturbs the other action in the past (Past Continuous)


                                         Past Simple

Past -------------------------------|----------------------------------------->Past

                                                                    Past Continuous   

Past Simple
Regular Verbs -ED                                     I played the piano.                       
Irregular Verbs 2nd column                       He stole an apple.

Past Continuous

To be                                      Main Verb
(Past Simple)                   +   (Gerund)

Irregular 2nd column                -ING


I was walking down the street when I saw a lemon tree.

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