The perfect aspect is a grammatical aspect that refers to a state resulting from a previous action (also described as a previous action with relevance to a particular time, or a previous action viewed from the perspective of a later time). The perfect aspect is not the same as the perfective aspect. See the perfective vs. perfect section of Grammatical aspect. In English, the perfect aspect can be combined with any simple tense (past, present or future), yielding perfect tenses that are formed using the conjugations of the auxiliary verb have and a verb: