98. The use of who, with its possessive and objective, is seen in these sentences:—
Who is she in bloody coronation robes from Rheims?—De Quincey.
Whose was that gentle voice, that, whispering sweet,
Promised, methought, long days of bliss sincere?
—Bowles.
What doth she look on? Whom doth she behold?—Wordsworth.
From these sentences it will be seen that interrogative who refers to persons only; that it is not inflected for gender or number, but for case alone, having three forms; it is always third person, as it always asks about somebody.
Use of which.
99. Examples of the use of interrogative which:—
Which of these had speed enough to sweep between the question and the answer, and divide the one from the other?—De Quincey.
Which of you, shall we say, doth love us most?—Shakespeare.
Which of them [the sisters] shall I take?—Id.