单句由主语和谓语构成，并表达一个完整的意思。一个单句即为一个句子。
An independent clause is a group of words that contains a subject and verb and expresses a complete thought. An independent clause is a sentence.
谓语动词后面可跟名词短语构成宾语，宾语是主语动作的承受者或状态的结果。
The verb group may be followed by another noun group, which is called the object. The object is the person or thing affected by the action or situation.
名词词组和动词词组是句子中最重要的词组，它们构成句子中两个主要的句法类型，即主语和谓语。
NP and VP are essential components of a sentence. They form the two major syntactic categories, that is, the subject and the predicate of a sentence.
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