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.
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.
应该注意对这种化学品对环境影响的研究。[原句的主语和谓语合译成汉语无主句的谓语。]。
Attention should be paid to the study of the chemical's effects on the environment.
谓语动词的数和人称与其主语相一致。
谓语和主语应该在人称和数方面保持一致。
The predicate should be in agreement with the subject in person and number.
一个简单句仅有一个主语和一个谓语。
A simple sentence contains but one subject and one predicate.
一个简单句仅有一个主语和一个谓语。
A simple sentence contains but one subject and one predicate.
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