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

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OnSundayevening,Samusually(watchesTV).括号中为什么要填watchesTV?OnSundayevening,Samusually(watchesTV).括号中为什么

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.