Sunday, 8 November 2015

Compound subject whose parts are joined by "and" and verb agreement : when is the singular correct?

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 ?

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