Complete the rules with the missing words

• long
• Continuous
• interrupted
• Simple
• -ed
• second
• V-ing

Here's a brief explanation of the rules of using Past Simple and Past Continuous in one sentence. In this sentence there are two verbs:

I was doing my homework when the phone rang.

         The first action is a             [ ] action — it lasted for a period of time. Therefore we use Past             [ ].

         The second action is a short action that             [ ] the first one. So, we use Past             [ ]. 

        Past Simple is formed using the            [ ] ending or the             [ ] form of the verb.

        Past Continuous is formed using was/were +             [ ].