We often avoid repeating the continuous form, do we? Like you say
- What do you think you are doing?
instead of
- What are you thinking you are doing?
How about the following sentences?
- I wasn't listening carefully to what the teacher was saying.
- I wasn't listening carefully to what the teacher said.
- I didn't listen carefully to what the teacher was saying.
- I didn't listen carefully to what the teacher said.
Which one do you think is the most natural? How should I choose which one to use?