In English, verbs (words that express an action or state of being) have five forms.
Infinitive Form: to + basic verb
不定式：to + 动词的基本形式
Simple Present: basic verb or basic verb + "s" (3rd person singular); expresses action that is happening in the present or a state that is presently occurring
Simple Past: basic verb + "ed"; expresses action that happened in the past
Present Participle: basic verb + "ing"; expresses action that is ongoing
Past Participle: basic verb + "ed"; past participles can be used in several ways, but one way is as an adjective to describe a noun
Examples of Verb Forms:
Below are some examples of the five verb forms for some additional regular verbs in English.