1

When talking about a specific category of objects, does it make more sense to attach plurality to the label of the category, as in:

Dogs are in the kingdom of animals, which also include cats.

or to attach singularity to the category itself, as in:

Dogs are in the kingdom of animals, which also includes cats.

?

  • 4
    It's your attachment ambiguity; you can set it up any way you like. Each choice indicates a different attachment for the relative clause; singular verb agreement means that which is coreferential to -- and the relative clause modifies -- kingdom of animals, while plural means that which is coreferential to -- and the relative clause modifies -- animals. Either is possible, and it's completely ambiguous if modals are used: the kingdom of animals, which can also include cats. _ – John Lawler Mar 2 '15 at 21:38
  • @JohnLawler Surely, an answer. – bib Mar 2 '15 at 23:24
1

The second one is correct in your case. Basically, the correct forms are:

For plural categories:

All the categories include cats.

For plural members:

This category includes cats and dogs.

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