english grammar mistake

Question

"none of them is good" is not correct or appropriate english grammar. the correct phrase should be are, not is. I am seeing several english grammar mistakes in here. quite disappointed.

Maarten Kamp · Accepted Answer

Janet, 
The sentence is not wrong, the grammar is correct in British English.
This sort of issue has been discussed previously. It is most likley regional difference, as the verb in singular form here is in keeping with the formal style in writing that the Oxford dictionary notes on British English use.  It is also noted that either singular or plural verb form may be used.
 
 "   Grammar Point 
none ofWhen you use none of with an uncountable noun, the verb is in the singular:None of the work was done.When you use none of with a plural noun or pronoun, or a singular noun referring to a group of people or things, you can use either a singular or a plural verb. The singular form is used in a formal style in British English:None of the trains is/​are going to London.None of her family has/​have been to college. "
 https://www.oxfordlearnersdictionaries.com/definition/english/none_1