anonymous "[Running into the room where his brother was sleeping ,] The underlined part is a relative clause modifying 'room'. The bracketed part is a gerund-participial clause ( participial phrase in traditional grammar) functioning as an adjunct-- it provides non-essential information about 'Jack' in the main clause. anonymous Is this a simple sentence or a complex sentence?
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anonymous"[Running into the room where his brother was sleeping,]
The underlined part is a relative clause modifying 'room'.
The bracketed part is a gerund-participial clause (participial phrase in traditional grammar) functioning as an adjunct-- it provides non-essential information about 'Jack' in the main clause.
anonymous Or is it a subordinate clause, with his brother as the subject and was sleeping as the predicate?
Yes. Whenever you see an inflected verb, you have a full clause, either a subordinate or main clause.
Running into the room where his brother was sleeping, Jack jumped onto the bed exuberantly.
The underlined expression is a subordinate clause (non-finite), not a phrase, so it's a complex sentence.
Like most non-finite clauses it is subjectless, but we understand it as though it does have a subject. In this case, we understand it to be "Jack", since it was he who did