CONFUSION IN sentences formation

Question

I could have done as good as you did
or
I could have done as good as you.

Which sentence is correct and why? And can we use "as better as"—I mean is there any phrase like that?

And is this sentence correct?

What will you do after my going/his going??

Although StoneyB divided his answer into three sections, you've actually only asked two questions (his first two points both address your first question). For future reference though, please note that you should only ask one question at a time, or it might simply get closed. — FumbleFingers, Commented Mar 2, 2014 at 15:48
@roopa: I think you should delete your second question and open a new one. — Ricardo, Commented Mar 3, 2014 at 0:28

StoneyB on hiatus · Accepted Answer · 2014-03-02 14:54:05Z

Neither of your first two sentences is correct—you must use the adverb well instead of the adjective good. With that correction, both sentences are grammatical, and neither is to be preferred.

I could have done as well as you did.
or
I could have done as well as you.
Better is the comparative grade for both good and well, so that part is OK; but the construction as ADJECTIVE as must be replaced with ADJECTIVE than when ADJECTIVE is in the comparative degree:

I could have done better than you.
She is much smarter than he is.
“What will you do after his going?” doesn’t violate any rules, but it is very unlikely to be spoken or written. Ordinarily we would say “What will you do after he goes?”.

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