表示人类用man还是men?名词前不加冠词,表示总称,用复数还是单数?有规则可言吗?可数必用复数,不可数必用单数.最好能举例说明.

man表示男人的时候,单数加a,表是男人们用men,特指那个男的用the;当泛指人类是就用man
He had not expected the young man to reappear before
evening.
他没想到那个年轻男子傍晚前会再次出现.
I have always regarded him as a man of integrity.
我一直把他看作个正直的男人.
The chick initially has no fear of man.
小鸡最初不怕人.