“误认为”的英语可以翻译为：[法] take for ...

我误认为他要娶我。I was under the delusion that he intended to marry me.她的抑郁症被误认为是紧张。Her depression was misdiagnosed as stress.他被误认为是敌人的侦察兵,受了重伤.He was mistaken for an enemy scout and badly wounded....