Is it right to use a bare infinitive as a subject complement as in the following quote?

"Its true purpose is convince shoppers that your product is the preferred choice"

Another example:

"Their purpose is convince holders of political office of the importance of their industry but also to inform them about their expert knowledge and responsibility in their respective industry."




I am aware of that bare infinitive can be used when the sentence contains do as in this example:

The thing to do is [call for a taxi].

  • The quote says "A brand's first mandate is to ____" but your question asks "is it right to say It's true purpose is convince" (without the to). Can you clarify which structure you're asking about?
    – stangdon
    Jul 12, 2018 at 12:05
  • I have edited the question. I hope it is clear now.
    – Lahza
    Jul 12, 2018 at 13:01
  • 2
    The examples you found look like typos. I'd guess that the "to" in each case was simply missed in editing. Jul 12, 2018 at 13:04
  • Thanks Gary. I think you are right. Someone else just told me the same.
    – Lahza
    Jul 14, 2018 at 9:32

1 Answer 1


Neither reads as correct to me. Both sound like they're written badly. I'd write them as "is to convince" or "is convincing", depending on how you're using tense in the rest of the piece. Since the latter part of the second example also uses "to inform", the first form should be used. "Their purpose is to convince"

  • Thank you for answering my question. You are right that the first part is not consistent with second.
    – Lahza
    Jul 29, 2018 at 10:25

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