The present perfectThe aspect expressing completion. E.g.: He’s finished university. tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. is often used with superlative forms of adjectiveA part of speech that modifies, qualifies or restricts a noun or a pronoun. E.g.: The apples are ripe. ("ripe")s to express emphasisSpecial importance or attention given to something. E.g.: All I wanna do is have some fun..

This is the first time I have been to Prague.
This is the worst film I have ever seen.

This use also applies to the past perfect tense.

Jill was the most beautiful girl John had ever met.

This sentence means that until that time John had never met such a beautiful girl. It also implies that he has since then. If, however, poor John hasn't met anybody like her since then, we use the present perfect:

Jill was the most beautiful girl John has ever met.

With future tenses (this will be...) we use the present simple tense in such structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition."s.

This will be the last time that I buy you a tram ticket.

Diagrams

Present perfect with an incomplete period
Present perfect Present perfect to express annoyance

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