These are two different present tenses: simple present and present continuous. They're often interchangeable, but "to do your homework" is a one time act, which will be completed. "To be doing your homework" means you're busy at it, but may not complete it.
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ESLBeginnerDon't get me wrong I was really encouraged at the fact that a $3k camera can be used in this way to produce a feature film, I mean 5 years ago no way would anyone be doing this and I actually thought the quality on the big screen
ESLBeginnerWhy didn't the author just say "... no way would anyone do this ..." ? and what differences does the "be doing" make here?The continuous form (-ing) here suggests people being engaged in some generalized practice over a period of time.