They supposed him dead.是什么意思？

They supposed him dead.

他们以为他死了。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

supposed

adj. （按规定、法律、协议等）（不）应当，假定的，（只用于否定句）不准，（对某人所说的话表示气愤或不大理解）那是什么意思；v. 料想( suppose的过去式和过去分词)，意味着，[用于被动语态]认为应该，[用于祈使句]让；

例句
The tests are supposed to provide a basis for the assessment of children...
这些测试应该可以为评价儿童提供一个基础。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。

dead

adj. 死去的，完全的，无感觉的，呆板的；adv. 完全地，非常，绝对，极度；n. 死者，（死一样的）寂静，极寒时候；

例句
According to police accounts, Mr and Mrs Hunt were found dead on the floor of their kitchen.
据警方称，亨特夫妇被发现死在家里厨房的地板上。