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This question already has an answer here:

Which of the following is correct?

If Insurance company or Law Firm have changed their opinion then please let us know.

or

If Insurance Company or Law Firm has changed its opinion then please let us know.

marked as duplicate by Laurel, choster, jimm101, J. Taylor, Rand al'Thor Feb 16 at 13:29

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  • You have modified two different things (have / has and their / its) at the same time. That makes it impossible to answer in a reasonably coherent fashion—and also doesn't indicate your specific area of concern. – Jason Bassford Jan 11 at 19:08
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The correct answer is:

If the Insurance company or Law Firm has changed its opinion, then please let us know.

The use of "or" implies one or the other and NOT both.

This answer is different like this:

If the Insurance company and Law Firm have changed their opinions, then please let us know.

Another thing you might note is this same concept throws native speakers and many might do this wrong and use the plural form of the verb. (i.e. have instead of has with or)

Also, very few native speakers will correctly use "its" as the possessive in the sentence using "or." Most would probably use "their."

Thanks to @Acccumulation, another good reference for this would be: https://owl.purdue.edu/owl/general_writing/grammar/subject_verb_agreement.html

@Acccumulation put this in the comments, so I wanted to reference him/her.

Thanks @Acccumulation!

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