progressive aspect

[Anonymous]

i want to write(compare) the d/f b/c three book about Progressive Aspect. so what are the most things i have to focus on?

[RonBee]

I understand, I think, that you want to know what you should focus on the most concerning the progressive aspect, but I do not know what d/f, b/c, or three book refer to. :?

Progressive Aspect
https://www.usingenglish.com/glossar...ve-aspect.html

[Tdol]

I'm afraid I'm not familiar with these abbreviations either. ;-|