1

Some uncountable words like the word value should not be preceded with article. I am not sure about impact.

It has impact on the existing approaches.

or

It has an impact on the existing approaches.

0

You should use "an" because "impact" is a noun and is singular.

With a verb, you don't need and should not use "an":

It affects the existing approaches.

and with a plural noun, you should not use "an" but you may want some other word:

It has impacts on the existing approaches.

Is grammatical but, to me at least, it reads a little oddly and you might want to put "some" or "many" or "a few" between "has" and "impacts".

3
  • Thanks. But I do not see my sentence which does not contain verb and not plural. So do you mean my sentence should be: "It has an impact on existing approaches"?
    – None
    Jun 20 '19 at 10:20
  • @None Yes, he means it. But you omitted the in front of existing, though I don't think that omission make any difference. Jun 20 '19 at 10:46
  • @None Sorry but I don't understand what you are asking.
    – Peter Flom
    Jun 20 '19 at 13:16

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