But colloquial usage varies, and such expressions are avoided by careful writers. The following sentences show how this may be done:—

227. In such expressions as the following, the subject is not compound, and the verb agrees with its singular subject:—

228. Nouns that are plural in form but singular in sense commonly take a verb in the singular number ([§ 84]).

In some words usage varies. Thus, pains, in the sense of care or effort, is sometimes regarded as a singular and sometimes as a plural.

Great pains has (or have) been taken about the matter.

229. Collective nouns take sometimes a singular and sometimes a plural verb.