(b) Clauses introduced by a relative or interrogative adjective: [The man whose library is well furnished is rich. I see which way I ought to take].
(c) Clauses introduced by a relative or interrogative adverb, such as when, whenever, since (referring to time), until, before, after, where, whence, whither, wherever, why, as, how: [I know the house where lie lives].
(d) Clauses introduced by a subordinate conjunction, such as because, since (= because), though, although, if, unless, that (= in order that), as, as if, as though, then: [I will go since you wish it].
C. Subordinate clauses may also be classified according to the nature of the thought expressed.
(a) General description: [The house, which stands on the hill, has a fine view].
(b) Place: [The house where he was born is torn down].
(c) Time: [He works whenever he can].
(d) Cause: [Since you wish it, I will go].
(e) Concession: [Although he is my friend, I can see his faults].
(f) Purpose: [Run, that you may obtain the prize].