I already know that words like "team" that emply a group of people, require they when you use a pronoun. But what with "anybody", "somebody"? I think it's "they" as well, but can you confirm? And what about words like "mankind". And "progeny"?
Thank you in advance.
"Team" and some other collective nouns can be treated as singular or plural depending on context, therefore "it" or "they" is OK.
•The team plays (it plays) according to its schedule. (unit = singular)
•The team couldn't agree (they couldn't agree) on their goals. (individuals = plural)
Somebody, anybody, nobody are singular pronouns an take a singular verb form.
Mankind/Progeny = singular/it
And I agree that 'anybody etc.' take a singular verb form, but the question was what preposition they take.
If you know the sex of "anybody", you'd write, "Anybody who forgot to bring his (her) assignment ...
Otherwise, you can use "his/her assignment", "his or her assignment", "their assignment", or change the sentence to avoid the problem: "Students who have forgotten to bring their assignments, see me after the class".
Note, however, that "they" is not a plural pronoun when it's used in this case. It's a singular "they" - just as 'you' has identical singular and plural forms.
I don't think I disagree with your post but at the same time I don't think I fully understand the reference to "preposition" and "they". Did the original post mean possessive adjective (his, her, their etc.) not preposition and your post "their" not "they"?
If anybody is late, they need to see me after class. I mean all cases/forms of the pronoun "they", including the possessive adjective.
This blog entry by Tdol may be relevant to this topic.