是动词被动式，而且be prepared to do不符合主谓宾结构，to do不定式不能做宾语。be prepared to do sth愿意做某事，prepare to do sth准备做某事。

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如:We are prepared to supply the goods you asked for. 我们准备好供应你要的货物。

I'm not prepared to listen to your weak excuses. 我不想听你那站不住脚的借口。