On Sunday evening,Sam usually (watches TV).括号中为什么要填watches TV?

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On Sunday evening,Sam usually (watches TV).括号中为什么要填watches TV?

On Sunday evening,Sam usually (watches TV).括号中为什么要填watches TV?
On Sunday evening,Sam usually (watches TV).括号中为什么要填watches TV?

On Sunday evening,Sam usually (watches TV).括号中为什么要填watches TV?
On Sunday evening,Sam usually (watches TV).括号中为什么要填watches TV?
因为usually一词表示“通常”,属于【经常性、习惯性】,所以,第三人称单数的一般现在时的谓语动词要在动词原形后面加s或es.