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The English native speaker teacher of a friend wrote the following question:

What role does reason and emotions play in sharing knowledge?

What role does reason and emotions play in sharing knowledge?

As far as I know, this question has a grammarticalgrammatical error, for the subject is plural  : reason and emotions.reason and emotions. So it should be:

What role do reason and emotions play in sharing knowledge?

What role do reason and emotions play in sharing knowledge?

However, I think that if his teacher had taken "reason and emotions"reason and emotions as one whole unit, then he could use DOESdoes instead of DO.do. I am not sure if that way of expressing the question would be idiomatic though. Is it possible the usage of DOESdoes possible in this case, or is it just a grammatical error?

The English native speaker teacher of a friend wrote the following question:

What role does reason and emotions play in sharing knowledge?

As far as I know, this question has a grammartical error, for the subject is plural  : reason and emotions. So it should be:

What role do reason and emotions play in sharing knowledge?

However, I think that if his teacher had taken "reason and emotions" as one whole unit, then he could use DOES instead of DO. I am not sure if that way of expressing the question would be idiomatic though. Is it possible the usage of DOES in this case, or is it just a grammatical error?

The English native speaker teacher of a friend wrote the following question:

What role does reason and emotions play in sharing knowledge?

As far as I know, this question has a grammatical error, for the subject is plural: reason and emotions. So it should be:

What role do reason and emotions play in sharing knowledge?

However, I think that if his teacher had taken reason and emotions as one whole unit, then he could use does instead of do. I am not sure if that way of expressing the question would be idiomatic though. Is the usage of does possible in this case, or is it just a grammatical error?

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"what role DOES reason and emotions play (...)?" - formulated by English native speaker teacher

The English native speaker teacher of a friend wrote the following question:

What role does reason and emotions play in sharing knowledge?

As far as I know, this question has a grammartical error, for the subject is plural : reason and emotions. So it should be:

What role do reason and emotions play in sharing knowledge?

However, I think that if his teacher had taken "reason and emotions" as one whole unit, then he could use DOES instead of DO. I am not sure if that way of expressing the question would be idiomatic though. Is it possible the usage of DOES in this case, or is it just a grammatical error?