1) none: My understanding: none means 'not one.' It is, therefore, always singular. An example:
"None of the actresses' noses was real."
For this I was trounced. None, it turns out, means not only 'not one' but also 'not any.' Usage depends on which one makes a more pleasing sentence.
And so this sentence is grammatically correct.
"None of the actresses' noses were real."
I stand, trembling at the knees, corrected.
From the grammar goddess: Indefinite pronouns by definition reference nonspecific things or people. Most of these pronouns take a singular verb, some are always plural, and a few may be either singular or plural. Take a look at the lists below, and you'll notice that most indefinite pronouns are singular.
* Singular: another, anybody, anyone, anything, each, either, everybody, everyone, everything, many a, neither, no one, nobody, nothing, one, other, somebody, someone
* Plural: both, few, many, others, several
* Singular or Plural: all, any, none, some, such
2) they: My understanding: The word 'they' is plural.
"They sure look like they're having a lot of fun."
Again, I was trounced. It turns out that 'they' has been used, since Middle and Early Modern English times, in both plural and singular forms. In the Eighteenth Century, singular 'they' and 'he or she,' were replaced with 'he' in an attempt to stress male dominance.
From The Vocabula Review:
But even an Act of Parliament in 1850 England, which banned official use of the expression he or she in favor of generic he , didn't affect the spoken language (Bodine 173).
So this sentence is entirely correct:
"I can't tell from this picture if the person is male or female but they sure have a great body."
I am no longer able to stand corrected, but must sit. I must sit and ponder this: Shakespeare used 'they' as singular as well as plural. If he did it, I'll do it. At least, I'll give it a try.
Picture credits:
Jennifer Grey: plasticsurgerybeforeandafter.blogspot.com
Nicole Kidman as Virginia Woolf: listal.com
Scarlett Johanson: thehoesofhollywood.blogspot.com
gitls having fun: sucksorrules.com
androgymous person: sleevage.com
Shakespeare:shakespeare2006.net
