anybody,anyone,everybody,everyone,nobody,都是单数,按语法的一致性的要求,在正式文体里,代词也应该用单数,但在口语和非正式的文体里,为了避免用he or she,也可以用复数代词.
Anybody can do it if they try(正式用if he or she tries).
Anybody in their senses would have acted in that way.
这个地方的语法还是比较的模糊地,所以,首选his,次选their,不选二者之外的.
当every或each修饰由and连接的两个单数名词时,要用单数代词,(英语习惯在his和her间选用his)
如:Each teacher and student is asked to do his work
当指由and连接的两个单数名词,其中一个为阳性,另一个为阴性,且前面有every或each修饰时,要用单数代词his.
如:
Every man and woman should be paid equallyaccording to his work.
Each boy and girl has his own rights