介系詞(preposition) 1. The birds in the trees are singing. 2. The birds are singing in the trees 前置詞片語(preposition phrase)或介系詞片語有兩項功能: (1)當形容詞用, (2) 當副詞用。 句(1) in the trees在名詞之後,當形容詞用;
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