The present perfect is a verb tense used to describe actions that occurred at an unspecified time in the past and are relevant to the present or have an effect on it. It is formed by using the auxiliary verb "has" or "have" followed by the past participle of the main verb. For example, in the sentence "I have lost my keys," the phrase "have lost" indicates that the action of losing the keys happened in the past, and it directly affects the present situation, as the keys are still missing now. The present perfect is useful for expressing experiences, changes, and situations that continue to the present, allowing speakers to connect past actions to current contexts.

“present perfect”的英语定义和含义

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