Be动词是原型，am，is，are是be动词的变形.
be ready to do是这个动词的搭配形式，意思是必须要用be动词.
至于用那个形式，与语境中的主语有关.
比如主语是我：I am ready to do my homework.
主语是他：He is ready to sleep.
主语是他们:They are ready to go home.
就像do在具体语境下是不同动作一样，不同的动作发出者用的就是不同的be动词的形式
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be与am is are的区别
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