Question

quick grammer question,

She explains this by using John's work.
She explains this using John's work

Are these both grammatically correct?

Answer 1

I would say yes, though you'd need a comma with the second one (and let's give it a more specific noun) --

She explains this concept, using John's work.

You could also flip it and say --

Using John's work, she explains this concept.

The addition of the preposition "by" is encouraged in some environments to prevent misreading. I find it a little awkward, however.

You can also revise entirely --

She uses John's work to explain this concept.

Answer 2

awesome! Thanks for the explanation :)

Answer 3

Sure thing . . .