Although it sounds simple, plural and singular words are not always placed with the appropriate version of a verb. While many people understand what to do for she, we and they, it gets harder for indefinite pronouns (those which refer to something not specific).

The following indefinite pronouns are always singular, even though they might, by implication, suggest many people:

another, anybody, anyone, each, either, every, everybody, everyone,
neither, nobody, no one, one, somebody, someone
Anything is possible in your dreams.
Everybody comes in the front door.

There are a few indefinite pronouns that may be singular or plural, depending on their use. They are:

any, all, none, more, most, some
All of us are running late. All is not lost.
None is more important than honesty. None of those books are mine.