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  2. Uses of English verb forms - Wikipedia

    en.wikipedia.org/wiki/Uses_of_English_verb_forms

    The past perfect progressive or past perfect continuous (also known as the pluperfect progressive or pluperfect continuous) combines perfect progressive aspect with past tense. It is formed by combining had (the past tense of auxiliary have), been (the past participle of be), and the present participle of the main verb.

  3. Pluperfect - Wikipedia

    en.wikipedia.org/wiki/Pluperfect

    The word "perfect" in this sense means "completed"; it contrasts with the "imperfect", which denotes uncompleted actions or states. In English grammar, the pluperfect (e.g. "had written") is now usually called the past perfect, since it combines past tense with perfect aspect. (The same term is sometimes used in relation to the grammar of other ...

  4. Contraction (grammar) - Wikipedia

    en.wikipedia.org/wiki/Contraction_(grammar)

    A contraction is a shortened version of the spoken and written forms of a word, syllable, or word group, created by omission of internal letters and sounds.. In linguistic analysis, contractions should not be confused with crasis, abbreviations and initialisms (including acronyms), with which they share some semantic and phonetic functions, though all three are connoted by the term ...

  5. Past perfect continuous - Wikipedia

    en.wikipedia.org/?title=Past_perfect_continuous&...

    Uses of English verb forms#Past perfect progressive To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .

  6. Game theory - Wikipedia

    en.wikipedia.org/wiki/Game_theory

    Separately, game theory has played a role in online algorithms; in particular, the k-server problem, which has in the past been referred to as games with moving costs and request-answer games. [125] Yao's principle is a game-theoretic technique for proving lower bounds on the computational complexity of randomized algorithms , especially online ...

  7. Pittsburgh - Wikipedia

    en.wikipedia.org/wiki/Pittsburgh

    Pittsburgh (/ ˈ p ɪ t s b ɜːr ɡ / PITS-burg) is a city in and the county seat of Allegheny County, Pennsylvania, United States.It is the second-most populous city in Pennsylvania (after Philadelphia) and the 68th-most populous city in the U.S., with a population of 302,971 as of the 2020 census.

  8. Prototype - Wikipedia

    en.wikipedia.org/wiki/Prototype

    Prototype software is often referred to as alpha grade, meaning it is the first version to run. Often only a few functions are implemented, the primary focus of the alpha is to have a functional base code on to which features may be added.

  9. Real estate - Wikipedia

    en.wikipedia.org/wiki/Real_estate

    Real estate is property consisting of land and the buildings on it, along with its natural resources such as growing crops (e.g. timber), minerals or water, and wild animals; immovable property of this nature; an interest vested in this (also) an item of real property, (more generally) buildings or housing in general.