Sam is always friendly to his parents.一定要有 is

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Sam is always friendly to his parents.一定要有 is
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Sam is always friendly to his parents.一定要有 is
Sam is always friendly to his parents.一定要有 is

Sam is always friendly to his parents.一定要有 is
一定要有is
因为sam是主语,friendly是表语,中间要用is(系动词)连接
请点击下面的“选为满意答案”按钮,

是的,is是谓语。

一定要有 is

be friendly to
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