'all' and 'none' can be singular or plural. The verb agrees in number with their referent:
1a) All is lost. (Everything is lost.) *set expression
1b) All are lost. (All of the people on the boat are lost.)
2a) All is well. (Everything is well.) *set expression
2b) All are well. (All the people on the boat are well.)
3a) All are welcome. (All of you are welcome.)
3b) All is welcome. (Anything you want to do is welcome.)
If you want 'none' to mean not a single one of, then use a singular verb, and if you want 'none' to mean not any, then use a plural verb:How about 'None'?
1a) None of them has hairpins. (not a single one of them)
1b) None of them have hairpins. (not any of them)
2a) None of us (not a single one of us) is perfect.
2b) None of us (not any of us) are perfect.
3a) None (not a single one of us) is so fallible as those who are sure they are right.
3b) None (not any of us) are so fallible as those who are sure they are right.
Examples 1a), 2a), and 3a) follow the (basic) traditional rule. Know the rule, then the exceptions, right? That's probably why your son's teacher hasn't yet talked about the b examples.
- For Teachers