Singular (only 1) subjects need a singular verb. Singular verbs end in "s" like is, does, has, was.
Plural (more than 1) subjects need a plural verb. Plural verbs don't end in "s" like are, do, have, were.
Other singular subjects include: one, body, and thing words
anyone
anybody
anything
no one
nobody
nothing
someone
somebody
something
everyone
everybody
everything
Does anyone want ice cream?
Anybody is welcome.
Anything is possible.
No one has the answer.
Nobody does the laundry anymore.
Nothing is happening.
Someone does know the answer.
Somebody is going to win.
Something has to happen.
Everyone does their work.
Everybody writes neatly.
Everything is awesome.
Either and neither also indicate a singular subject
and should be used with a singular verb.
Either was a good choice.
Neither is going to work.
Compound subjects are plural.
Mom and Dad sail the boat.
Mrs. Poe and Ms. Flowers are my teachers.
When OR combines subjects,
look at the last subject to choose the verb.
The cat or the dogs eat the food.
The cats or the dog eats the food.
Complete Subject/Predicate