Grammatically Correct: The writer's essential guide to punctuation ...

Problem Category 1:
The Subject, the Whole Subject and
Nothing but the Subject
The subject of a sentence can be any sort of entity: a person, a place,
an object either concrete or abstract-in short, a noun. It can also
be a pronoun that refers to an entity identified elsewhere, or a verb
form (a gerund or infinitive) functioning as a noun. The subject is
the focus of the sentence: the actor or the center of interest. It
either does something, has something done to it or is described in
some way. Thus, it is always tied to an accompanying verb. (For a
more complete description, see "Basic Sentence Structure" on page
55.)
This section describes scenarios where writers often fail to recognize
precisely which words make up the subject, and hence treat
what should be a plural as a singular or vice versa.
COMPOUND SUBJECTS
A sentence may contain a compound subject: two or more nouns,
pronouns, gerunds or infinitives that share the same verb and are
linked by and. With a few exceptions, the verb for a compound
subject is always plural. This applies whether each part of the compound
is itself singular or plural.
Your enthusiasm and participation have been much appreciated.
[both parts singular]
The books and records~ in the study.
[both parts plural]
Frank's resume and reference letters are ready to be photocopied, now
that the typos and grammatical mistake have been fixed.
[one part singular, one part plural, either order]
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