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Is it "is" or "are" after "that" in the expression ...X of Y that is/are? Context provided in the question

English Language & Usage Asked on August 30, 2021

I am aware of the solution using "can" or "will" to circumvent the issue, but I really want to know the answer. In the sentence below, "efficacy" is what "that" describes, not "gamification mechanics". However, the word "that" immediately follows "gamification mechanics", which got me confused.

Cross-platform comparison of multiple pro-green programs will be a valuable addition to the literature because it helps researchers measure the efficacy of gamification mechanics that is/are particularly robust in some situations but not others.

Any suggestions would be welcomed. Thank you in advance.

One Answer

Were mechanics plural, you could use are to refer unequivocally to mechanics, or is to refer to efficacy.

However,

Mechanics = mechanics noun, plural in form but singular or plural in construction

Merriam Webster

This means that is/are is preceded by efficacy (singular) and by mechanics (singular or plural). The meaning therefore remains ambiguous and unclear.

One way (obviously not the only one) of avoiding the problem may be to make an emphatic repetition:

“... measure the efficacy of gamification mechanics that is particularly robust in some situations, an efficacy that is not so robust in others.”

Answered by Anton on August 30, 2021

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