一、动词不定式作主语动词不定式作主语经常放在句子的最后,而用it作形式主语。谓语通常用单数。如:It’s a pleasure to see you again.对比:动词不定式作主语时,经常表示具体的动作,尤指将来的动作。而动名词作主语时,经常表示一般的情况,指动名词所表达的事情。如:To become One, verb infinitive as the subject verb infinitive as the subject is often placed at the end of the sentence, and use it as a form of subject. Predicates are usually singular. For example: It’s a pleasure to see you again. Contrast: When the verb infinitive is the subject, it often represents a specific action, especially a future action. When the gerund is the subject, it often indicates the general situation and refers to the things expressed by the noun. Such as: To become become