the patient suffering from a cough soon found it necessary to give up smoking为什么不用it is necessary

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the patient suffering from a cough soon found it necessary to give up smoking为什么不用it is necessary
the patient suffering from a cough soon found it necessary to give up smoking为什么不用it is necessary

the patient suffering from a cough soon found it necessary to give up smoking为什么不用it is necessary
不能用it is necessary.如果用的话就必须加上that作为从句出现:
the patient suffering from a cough and soon found that it is necessary to give up smoking
find it necessary to 是固定词组:必要的

也可以用。只不过find +it +形容词+不定式也是习惯表达法。
found 接从句:that it was necessary for him to give up smoking.