my english teacher's voice sounds中sound为什么要加sMy English teacher's voice sounds nice and gentle sound为什么加s

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my english teacher's voice sounds中sound为什么要加sMy English teacher's voice sounds nice and gentle      sound为什么加s

my english teacher's voice sounds中sound为什么要加sMy English teacher's voice sounds nice and gentle sound为什么加s
my english teacher's voice sounds中sound为什么要加s
My English teacher's voice sounds nice and gentle
sound为什么加s

my english teacher's voice sounds中sound为什么要加sMy English teacher's voice sounds nice and gentle sound为什么加s
第三人称单数 的动词形式

voice 是不可数名词,可用it代替,所以后面的动词要变三单