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I am not certain who he is.是什么意思？

I am not certain who he is.

我无法确切说出他是谁。

相关词汇
am not certain who he is

am

abbr. (=amplitude modulation) <无>调频，调谐；vi. （用于第一人称单数现在时）是；aux. （与v-ing连用构成现在进行时，与v-ed连用构成被动语态）；

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

certain

adj. 某一，必然的，已确定的；pron. [动词用复数]某些；

who

pron. 谁，什么人，关系代词，有先行词，孰；

he

pron. 他，它，一个人；n. 雄性动物；

is

vt.& vi. 是（be的三单形式；n. 存在；
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