I have seen some texts where it is used "exist" on affirmative sentences.

I knew that for affirmative sentences with he/she/it, it must be used S at the end of the verb.

For example, a sentence that I saw in an article:

The application needs to exist.

  • Is this sentence correct? "needs to exists" would be incorrect?
  • Wouldn't be correct exists, since that the person here is the application (it)?
  • If it is not correct, can someone point a source which explains the concept?
  • 1
    I'm not sure I understand your question: "Wouldn't be correct exists.. ?" Are you asking if exists is correct ? "The application needs to exist." is correct because as you say "for affirmative sentences with he/she/it, there must be an S at the end of the verb."
    – None
    May 8, 2017 at 17:05
  • Hi, Laure. I made and edition on the question. I believe that now is clearer. Thank you!
    – ivanleoncz
    May 8, 2017 at 17:09

2 Answers 2


Your choices are

The application needs to exist in the codebase.

where to exist is an infinitive phrase, or

The application exists in the codebase.

where exists is the verb.


Whether you put an s or es on the end of a verb depends on its subject and nothing else.

If a present tense verb's subject is a singular third person subject (he, she, it, etc.), s or es is used.

Any other situation, no s or es is added. This includes the infinitive to + {verb}.

Exception is to be (use is) and to have (use has).

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