My grandpa always tells me I can't be noisy The teacher told me not to be late again.第一个句子为何没有应用tell sb not to do sth 而直接是.I can't be noisy.另外,told前是第三人称为何不变单三?

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My grandpa always tells me I can't be noisy The teacher told me not to be late again.
第一个句子为何没有应用tell sb not to do sth 而直接是.I can't be noisy.
另外,told前是第三人称为何不变单三?

第一句是一个宾语从句,其实也可以变成像你说的那种用动词不定式作宾补的形式,即
My grandpa always tells not to be noisy.我爷爷总是告诉我不要吵闹.
第二句中的told是过去式,你所说的单三是在一般现在时的句子中,如果主语是第三人称单数,谓语动词要变成单三形式,而本句的时态是一般过去时,而told就是过去式,过支式不分人称的变化,都是一样的,即没有单三形式
有不明白的请继续追问,

tell sb that+句子 也可以的
told是tell 的过去式

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