the subject of a sentence 基本例句 句子的主语 Underline the subject of this sentence.在这个句子的主语下画线。 If you have placed the subject of your sentence directly next to the verb, it is incorrect to use a comma to separate the subject and verb.如果句子的主语直接放在动词之前,则不可用逗号来分隔主语和动词。