Question

angthing有复数形式吗？

Answer 1

单数。
anything是不定代词，作主语时谓语动词要用单数。
1、常用不定代词有：some（something,somebody,someone,somewhere）,any（anything,anybody,anyone,anywhere）, no（nothing,nobody,no one）, every（everything,everybody,everyone,everywhere）,all,each,both,much,many,（a）little,（a）few,other（s）,another,none,one,either, neither等.
2、如果主语是some（something,somebody,someone,somewhere）,any（anything,anybody,anyone,anywhere）, no（nothing,nobody,no one）, every（everything,everybody,everyone,everywhere）,each,a (little), another,none,one,either 等时,谓语动词用单数形式.
3、如果主语是all,both, all, others 等时谓语动词用复数.

Answer 2

anything和something都是代词,代词也就没有所谓的单复数,因为只有名词才会有单复数之分.
anything和something的谓语动词应该是单三形式

Answer 3

没有

anything
[英][ˈeniθɪŋ][美][ˈɛniˌθɪŋ]
pron.任何东西; （用于否定句、疑问句中以及 if 或 whether 和 prevent、ban、avoid 等动词后，代替 something）任何东西; 重要东西; 重要事物; 
网络：什么事; 一切; 任何事物; 
The surveyor's report didn't highlight anything untoward.
勘测员的报告没有指明有任何麻烦问题。