usage - "What I have to do is" + verb inf



I'm confused about the following examples, and I'm pretty sure I've seen both of them in books and white papers.



  • What I have to do is find her.

  • What I have to do is to find her.

  • What I would like to do is to buy it.

  • What I would like to do is buy it


Can anyone please tell me which one is correct?


Many thanks




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