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  2. Uses of English verb forms - Wikipedia

    en.wikipedia.org/wiki/Uses_of_English_verb_forms

    The present progressive or present continuous form combines present tense with progressive aspect. It thus refers to an action or event conceived of as having limited duration, taking place at the present time. It consists of a form of the simple present of be together with the present participle of the main verb and the ending -ing.

  3. Simple present - Wikipedia

    en.wikipedia.org/wiki/Simple_present

    The simple present is the most commonly used verb form in English, accounting for more than half of verbs in spoken English. [1] It is called "simple" because its basic form consists of a single word (like write or writes), in contrast with other present tense forms such as the present progressive (is writing) and present perfect (has written).

  4. Present continuous - Wikipedia

    en.wikipedia.org/wiki/Present_continuous

    The present continuous is formed by the present tense form of be and the present participle (-ing form) of the verb. [3] [4] For example, you would write the verb work in the present continuous form by adding the -ing suffix to the verb and placing a present tense form of be (am, are, is) in front of it: [3] I am working. You are working. She ...

  5. Parallel syntax - Wikipedia

    en.wikipedia.org/wiki/Parallel_syntax

    The first known instances of parallel syntax can be traced back to Aristotle in his book Rhetoric. [11] Aristotle underlines the fact that it is very useful in persuasion to pair multiple sentences, each with very similar clauses and phrases to the point that they are equal or nearly equal in syllable count; Aristotle perfected this art by creating various examples to be cited in a very ...

  6. Parallelism (grammar) - Wikipedia

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

    In grammar, parallelism, also known as parallel structure or parallel construction, is a balance within one or more sentences of similar phrases or clauses that have the same grammatical structure. [1] The application of parallelism affects readability and may make texts easier to process. [2]

  7. Concurrent lines - Wikipedia

    en.wikipedia.org/wiki/Concurrent_lines

    The de Longchamps point is the point of concurrence of several lines with the Euler line. Three lines, each formed by drawing an external equilateral triangle on one of the sides of a given triangle and connecting the new vertex to the original triangle's opposite vertex, are concurrent at a point called the first isogonal center.

  8. Progressive present - Wikipedia

    en.wikipedia.org/wiki/Progressive_present

    The progressive present is a grammatical tense that is used only if an action is actually in progress at the time. For example, in Spanish , "estoy leyendo" means "I am reading (right now)." It is formed by using the present indicative of estar plus the present participle of the verb.

  9. Distance between two parallel lines - Wikipedia

    en.wikipedia.org/wiki/Distance_between_two...

    the distance between the two lines is the distance between the two intersection points of these lines with the perpendicular line y = − x / m . {\displaystyle y=-x/m\,.} This distance can be found by first solving the linear systems