I am trying to figure out how to use whose to indicate possession.
Which of these sentences are grammatically correct?
(1) That is the friend who sold me his car.
(2) That is the friend whose car sold to me.
(3) I have to call my friend I accidentally picked up his umbrella after the meeting.
(4) I have to call my friend whose umbrella I accidentally picked up after the meeting.
(5) I met a woman at the party I went to school with his brother.
(6) I met a woman at the party whose brother went to school with me.
(7) The man I bought his car, I saw him on the beach.
(8) The man whose car I bought, I saw him on the beach.