Past perfect, Present perfect.
Past Perfect:
The past perfect refers to a time earlier than before now. It is used to make it clear that one event happened before another in the past. It does not matter which event is mentioned first - the tense makes it clear which one happened first.
Present Perfect:
The "present perfect" of any verb is composed of two elements: the appropriate form of the auxiliary verb to have (at present) and the "past participle" the main verb. The shape of the "past participle" is a regular verb root + ed, e.g. played, arrived, looked. As for the irregular verbs, see Table of irregular verbs 'verbs' section.
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