Characters
Your sentence
他 是 谁?
Words in this sentence
他
(third-person singular) (since the early 20th century, usu. male) he; him; his; (bound form) other; another; some other (as in 他日 (tārì) and 他人 (tārén))
是
to be (followed by substantives only); correct; right; true; (respectful acknowledgement of a command) very well; (adverb for emphatic assertion)
谁
who; also pr. shuí