The correct verb forms for the sentences involve using past continuous for ongoing actions at the specific time in the past, and simple past for actions that were completed. Deciding which form to use depends on whether the action is meant to be described as a complete event or an ongoing process at the time another event occurred.
Choosing the Correct Verb Form
When deciding between the simple past and past continuous (also known as the past progressive) tenses, it's important to determine if the action was ongoing at a specific time in the past (past continuous), or if the action happened at an indefinite time and was completed (simple past). Here are the correct verb forms for the given sentences:
I was listening to the radio when I heard this fantastic song.When the teacher said 'Stop!', I was still trying to finish the last question.I feel really silly! While I was dancing, I fell and broke my elbow.Tim was playing a computer game when his mum called him for lunch.I was looking for a file on my memory stick when I noticed there was a virus.Ron found a really interesting website about dance music while he was surfing the internet.
The simple past is used for completed actions and the past continuous is used to describe ongoing actions that were interrupted or happening at the same time as another action.
--The given question is incomplete, the complete question is
"Choose the correct option; 1 I listened / was listening to the radio when I heard / was hearing this fantastic song. 2 When the teacher said / was saying ‘Stop!’, I still tried / was still trying to finish the last question. 3 I feel really silly! while I danced / was dancing, I fell / was falling and broke / was breaking my elbow. 4 Tim played / was playing a computer game when his mum called / was calling him for lunch. 5 I looked / was looking for a file on my memory stick when I noticed / was noticing there was a virus. 6 Ron found / was finding a really interesting website about dance music while he surfed / was surfing the internet."--