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An open textbook is a textbook licensed under an open license, and made available online to be freely used by students, teachers and members of the public.Many open textbooks are distributed in either print, e-book, or audio formats that may be downloaded or purchased at little or no cost.
In the dynasties following the Song, the Three Character Classic, Hundred Family Surnames, and 1,000 Character Classic came to be known collectively as San Bai Qian (Three, Hundred, Thousand), from the first character in their titles. They were the almost universal introductory literacy texts for students, almost exclusively boys, from elite ...
A regular English verb has only one principal part, from which all the forms of the verb can be derived.This is the base form or dictionary form.For example, from the base form exist, all the inflected forms of the verb (exist, exists, existed, existing) can be predictably derived.
Originally a preterite; see English modal verbs: need (needs/need) – needed – needed: Weak: Regular except in the use of need in place of needs in some contexts, by analogy with can, must, etc; [4] see English modal verbs: ought – (no other forms) Defective: Originally a preterite; see English modal verbs: pay – paid – paid overpay ...
In English, objects and complements nearly always come after the verb; a direct object precedes other complements such as prepositional phrases, but if there is an indirect object as well, expressed without a preposition, then that precedes the direct object: give me the book, but give the book to me.
Digital textbooks are a major component of technology-based education reform. They may serve as the texts for a traditional face-to-face class, an online course or degree, or massive open online courses (MOOCs). As with physical textbooks, digital textbooks can be either rented for a term or purchased for lifetime access.
Verbs are then said to agree with their subjects (resp. objects). Many English verbs exhibit subject agreement of the following sort: whereas I go, you go, we go, they go are all grammatical in standard English, he go is not (except in the subjunctive, as "They requested that he go with them").
To some extent it may be a matter of convention or subjective preference to state whether a verb is regular or irregular. In English, for example, if a verb is allowed to have three principal parts specified (the bare infinitive, past tense and past participle), then the number of irregular verbs will be drastically reduced (this is not the ...