People believe that he is ill.改被动

People believe that he is ill.改被动

题目
People believe that he is ill.改被动
He is believed to be ill.
怎么会出现不定式to be
答案
He is believed to be ill.正确.
People say he has gone to London.
He is said to have gone to London.
People consider that he is writing a new novel.
He's considered to be writing a new novel.
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
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英语翻译
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