楼下有人要见你。 （原句中的主句部分thereisaman翻译成“有人”，然后将定语从句译成句子的谓语部分。）
is written by是第二个句子的谓语。
句子通常由两部分构成，即主语和谓语。
A sentence is composed, usually, of two parts, the subject and the predicate.
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.
句子成分和短语成分属于不同层面，只有主语和谓语属句子成分，其余均属短语成分。
Only the subject and the predicate are sentence elements while the rest are phrase elements.
《论语》动词主要作句子的谓语，还作主语、宾语、定语、状语。
Who can point out the subject, the predicate and the object of this sentence?
句子的组成部分，包括主语、谓语、宾语、补语、定语、状语六种。
Only the subject and the predicate are sentence elements while the rest are phrase elements.
句子的组成部分，包括主语、谓语、宾语、补语、定语、状语六种。
Only the subject and the predicate are sentence elements while the rest are phrase elements.
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