Need的助动词形式主要用于现在时态的疑问句、否定句和条件句中。
The auxiliary forms of need are used primarily in present-tense questions, negations, and conditional clauses.
述谓是句子基本单位，是对句子的抽象化，适用于包括陈述句、祈使句和疑问句。述谓由一个或数个论元和一个谓词组成。
Predication is the abstraction of the meaning of a sentence. it applies to all forms of a sentence, including statements, imperative and interrogative.
常用于疑问句或有能愿动词的句中。
It often occurs in an interrogative sentence or a sentence with an auxiliary verb.
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