而主语和谓语是英语句子最主要的成分。
Subject and predicate are the main elements of a sentence in English.
一般认为定语是英语句子的一个基本成分。
Attributive can be regarded as a basic element in English sentence.
每一个英语句子都有唯一的一个限定形式的谓语中心成分，汉语句子则随意得多。
Each English sentence has a unique predicate head in a definite form while Chinese sentence has more flexible forms.
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