Which of the following three is the correct usage of the phrase?
- As commonly done
- As is commonly done
- As it is commonly done
To me, 3rd one seems to be most appropriate from a grammatical perspective, however I'm not sure.
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The second option is more natural sounding to me (as a native English speaker).
The first sounds curt, and comes across as perhaps a little 'lazy'.
The third sounds stilted - the extra word adds nothing, and makes the sentence slightly harder to enunciate. However, this might be used in a more formal situation.
Hope that helps,