O, onu hangi kitabı satın alacağı konusunda yönlendirdi.
- She advised him on which book to buy.
Tom ve Mary hangisini satın alacakları konusunda anlaşamadılar.
- Tom and Mary couldn't agree on which one to buy.
... have to be a student of the different ways in which ideas ...
... way, close loopholes, deductions ' he hasn't identified which ones they are ' but thereby ...