That sounds good中的sounds为什么要加s

That sounds good中的sounds为什么要加s That sounds good.这里的sound为什么要加s? that sounds good 为什么不是that‘s sounds good ? sound interesting 为何不加,That sounds good 为何要加s,如果用that sounds Your story(故事)sounds good.sounds为什么加"s" That sounds good的sound为什么要加s?直接sound不好了 那听起来不错 thai sounds good sounds 后面为什么要加S That sounds great.sounds 为啥加s. That sounds interesting为什么加S The song sounds very interesting.sounds为什么要加s that's sounds good 和 that sounds good哪个对 是That sounds good还是That's sounds good