468. An adjective clause may be introduced by a relative pronoun or a relative adverb. For lists, see [§ 377].

I. Relative Pronouns
II. Relative Adverbs

Note. A preposition and a relative pronoun may often replace a relative adverb. Thus, in the second example, on which might be substituted for when.

II. PARTICIPLES

469. The subject may be modified by a participle (with or without modifier or complement).

In the fourth example the participle is modified by an adverbial phrase; in the fifth and sixth, it has an object; in the seventh, it has both an object and a modifier; in the eighth, it is followed by the predicate adjective sullen. In analysis, the whole participial phrase (consisting of the participle and accompanying words) may be treated as an adjective phrase modifying the subject; but it is simpler to regard the participle as the modifier, and then to enumerate its modifiers, etc., separately.