"The only thing holding me back is the available colours."


"The only thing holding me back are the available colours."

It seems to me like a glitch either way. I slightly favour the second one though.


The rule is simple. The verb agrees with the subject of the sentence.

The only thing...is... [correct]

The only thing...are... [incorrect]

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You can say 'The only thing is' or 'The only things are', but you can not say 'the only thing are'

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