✔ 最佳答案
The past continuous:-
I was playing
I was not playing
It was having,
When the clock struck a (3-2=1)hr period, I was not playing basketball.
In the eg.two actions happened in the past at the same time. The past continuous tense is used for the longer action(=was Not playing.)
When I was not playing basketball, it was having a (3-2=1) hr. period.
In the above eg.both actions were equally long, we use the past continuous tense for both.
I was Not playing football (Let's assume back to football) throughout the whole of the (3-1=2)hrs.
In the above eg., the past continuous tense is used to express a continuous action of playing/not playing football over a specified period(=3-1=2) in the past.