If superlative adjectiveA part of speech that modifies, qualifies or restricts a noun or a pronoun. E.g.: The apples are ripe. ("ripe")s (especially the first, the last) are used, an infinitive 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." can replace a defining relative clauseA group of related words containing a subject and a verb..

Geoffrey was the last to understand the joke. (= Geoffrey was the last person who understood the joke.)

If we want to express an actionA general term expressing that somebody or something does something in the passive voiceThe form of the transitive verb that shows whether the subject acts (active voice) or is acted upon (passive voice)., a passive infinitive is used:

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.

This is the first time I’ve been to China.
The 20th century has seen the bloodiest wars in the history of humankind.
Jill is the most intelligent girl in the class.

The past perfect is 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..

Jill was the most beautiful girl John had ever met.
It was the strangest music I had ever heard.

This 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." can replace a defining relative clauseA group of related words containing a subject and a verb.:

Geoffrey was the last to understand the joke. (Geoffrey was the last person who understood the joke.)

If we want to express a passive actionA general term expressing that somebody or something does something, we use a passive infinitive: