ensure is a verb in English, which means to guarantee or make something safe. verbs are a category of word in English that are used to express actions or states. In English grammar, verbs can be divided into two main types based on their function and usage: finite verbs and non-finite verbs. In Chinese grammar, verbs typically indicate actions or dynamic changes of people or things and usually appear after the noun subject or main clause. In English, verbs also undergo changes in tense.