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  2. Simple past - Wikipedia

    en.wikipedia.org/wiki/Simple_past

    Regular verbs form the simple past end-ed; however there are a few hundred irregular verbs with different forms. [2] The spelling rules for forming the past simple of regular verbs are as follows: verbs ending in -e add only –d to the end (e.g. live – lived, not *liveed), verbs ending in -y change to -ied (e.g. study – studied) and verbs ending in a group of a consonant + a vowel + a ...

  3. English grammar - Wikipedia

    en.wikipedia.org/wiki/English_grammar

    Regular verbs have identical past tense and past participle forms in -ed, but there are 100 or so irregular English verbs with different forms (see list). The verbs have, do and say also have irregular third-person present tense forms (has, does /dʌz/, says /sɛz/).

  4. Third grade - Wikipedia

    en.wikipedia.org/wiki/Third_grade

    In Brazil, third grade is the terceiro ano do Ensino Fundamental I, in this case, children begin their first year of elementary school at age 6 or 7 depending on their birthdate. Therefore, the 3rd year of elementary school is typically for students of 8 (96 months)–9 years (108 months) of age.

  5. Present tense - Wikipedia

    en.wikipedia.org/wiki/Present_tense

    Simple present : The simple present tense is employed in a sentence to represent an action or event that takes place in the present regularly. Present perfect : The present perfect tense is utilized for events that begin in the past and continue to the moment of speaking, or to express the result of a past situation.

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    [2] [3] Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics , most notably in Euclid 's Elements . [ 4 ] Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions ), until the 16th and 17th centuries, when ...

  7. Continuous performance task - Wikipedia

    en.wikipedia.org/wiki/Continuous_performance_task

    A continuous performance task, continuous performance test, or CPT, is any of several kinds of neuropsychological test that measures a person's sustained and selective attention. Sustained attention is the ability to maintain a consistent focus on some continuous activity or stimuli , and is associated with impulsivity .

  8. General radiotelephone operator license - Wikipedia

    en.wikipedia.org/wiki/General_radiotelephone...

    Obtaining any of the certificates required passing sequentially written examinations. To obtain the Second Class license required first passing the test for the Third Class permit, which was an easy exam on broadcast rules and operating procedures. To test for the First Class license one had to have passed the exam for a Second Class license.

  9. Crisis of the Third Century - Wikipedia

    en.wikipedia.org/wiki/Crisis_of_the_Third_Century

    The Crisis of the Third Century, also known as the Military Anarchy [1] or the Imperial Crisis, was a period in Roman history during which the Roman Empire nearly collapsed under the combined pressure of repeated foreign invasions, civil wars and economic disintegration.