لمن

In a sentence

• لمن هذا الكتاب؟

  Whose book is this?

  The word 'لمن' is an interrogative used to ask about possession.

• أعط الكتاب لمن يحتاجه.

  Give the book to whoever needs it.

  Here 'لمن' is used to indicate the person who satisfies a condition, translated as 'to whoever'.

• لا أعرف لمن أعطي هذه الرسالة.

  I don't know to whom I should give this letter.

  In this case, 'لمن' functions as a relative pronoun referring to the recipient.