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This question already has an answer here:

I am in doubt as to whether the subject-verb agreement of the second sentence of this paragraph is correct :

Unfortunately, there is no such thing as the ideal home workshop because most people are limited by the space available and by their budget.

However, the information and diagram here acts as a guide to help you formulate a sensible workshop layout and a machinery “wish list”.

I suppose if the compound subject is seen as a single unit, then the sentence can be considered as correct.

A little further in the same book, another sentence has a singular verb with a compound subject :

Alternatively commandeer a garage, or build yourself a substantial workshop if outdoor space and permission allows – however, do consider the impact of machinery noise on your neighbours.

Can "outdoor space and permission" be seen as one thing, or would this be considered a mistake ?

marked as duplicate by Edwin Ashworth, David, waiwai933 Aug 31 '17 at 22:57

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  • It sounds odd to my ear, but the line between two separate objects and two things seen as one isn't hard and fast. But I'm inclined to think typo or edit error here. – guifa Aug 21 '14 at 20:26
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    'Information and diagram' is illogical anyway, along the lines of 'food and cheese'. – Edwin Ashworth Aug 21 '14 at 22:19
  • If it was written "if outdoor space and permission allow", then I would think it sounded correct. – Oran D. Lord Aug 22 '14 at 1:51
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I would only treat a compound subject "X and Y" as singular if it were a compound phrase that very often occurs together and which people conceptualize as a single thing. For example, I might say "this rod and reel is all tangled up", or "that mortar and pestle is for sale", or "my gin and tonic is not strong enough".

In the examples you cite here, I would consider those verbs incorrect, as far as agreement with the subject. It would be more correct to say "the information and diagram here act as a guide...", and "outdoor space and permission allow..."

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