1)可與of連用；2)謂語動詞用單或復數；3)具體指什麽人或物；4)壹般用來回答how many +n,how
much +n及含any+n引起的疑問句。請看：
1) None of us have/has seen him.
2)——How many students are there in the room? ——None.
3)——Is there any water in the thermos? ——None.
4)——How much money do you have on you? ——None.
壹般連of壹起用。不獨立作主語。