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

GRAMMAR
that constitute a multimedia product. See the example for mathematics,
below.)
Rickets~ best prevented by adequate vitamin D and exposure to sunlight.
Despite its s ending, rickets is simply the name of a disorder, and
hence is singular. The same holds for some other diseases: for example,
shingles, measles, mumps.
We won't know the outcome until our data have been fully analyzed.
Data is the plural of the rarely (if ever) used datum, meaning a
single piece of factual information, such as a measurement or a
statistic. As a plural noun, it properly takes a plural verb. However,
it is increasingly being treated as a singular noun meaning the total
body of facts accumulated. Which way you handle it may depend
on the expectations of your audience. In scientific and academic
writing, plural usage is the only correct way; in linguistically laxer
environments, such as corporations, singular usage is accepted and
may even be required. (It must be acknowledged that words do
evolve. For example, the uncontroversial singular agenda, a list of
individual to-do items, originated as a plural of agendum.)
The phenomenon of shooting stars has fascinated people throughout
history.
Like criteria, phenomena is plural. One phenomenon is; multiple
phenomena are.
Graffiti were scrawled all over the walls.
Graffiti is properly the plural of graffito, a single drawing or message
scribbled on public property. The singular is unlikely to be used,
but the plural should be treated as a plural.
Dominoes ~an easy game to learn.
The individual pieces used in the game are plural (one domino,
multiple dominoes), but when used as the name of the game, this
word is simply a singular noun that ends in s. The same holds for
other games that are described as plurals: for example, checkers
or draughts, horseshoes or quoits, ninepins or tenpins,
tiddledy,winks.
At the border crossing, customs usually processes us quickly.
Used in the sense of traditions or habits, customs would be plural
221