1 It is important (for you) to be there on time.
2 It is important that you be there on time.
3 It is important, your being there on time.
4 It's unbelievable what doctors can do these days.
5 It's astonishing the amount of work he can do in one day.
As you can see, #3 shows a comma. Is this comma essential?
anonymous As you can see, #3 shows a comma. Is this comma essential? Yes.
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anonymousAs you can see, #3 shows a comma. Is this comma essential?
Yes. That "it" is a real pronoun and not the dummy "it".
anonymousAs you can see, #3 shows a comma. Is this comma essential?
Yes, you can do that, but you'd do much better not to use this sentence at all. Write it as
Your being there on time is important.
Or better yet, use 1 or 2 instead.
CJ