翻譯一句口語為英文

i know who that person is.
<===that person有指定某個人ge意思,我諗應該比較適合

I know　who（he/she ）is.

I know who that person is.

Hope that helps!

我知道 [某人] 係邊個
I know exactly who he/she is.

i know that people is who

I know who he/she is.

I knew that [somebody] is who

i know who john doe is!

I know who he/she is.

I know who (HE or SHE) is....
eg. If it is Peter, then say ....... I know who he is
eg. If it is Mary, then say ....... I know who she is

I know who he/she is.

I know who he/she is.