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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).
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 ...
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.
The continuous aspect is constructed by using a form of the copula, "to be", together with the present participle (marked with the suffix -ing). [6] It is generally used for actions that are occurring at the time in question, and does not focus on the larger time-scale.
A number of multi-word constructions exist to express the combinations of present tense with the basic form of the present tense is called the simple present; there are also constructions known as the present progressive (or present continuous) (e.g. am writing), the present perfect (e.g. have written), and the present perfect progressive (e.g ...
Other terms for the contrast lexical vs. grammatical include: situation vs. viewpoint and inner vs. outer. [10] [11] Lexical aspect, also known as Aktionsart, is an inherent property of a verb or verb-complement phrase, and is not marked formally. The distinctions made as part of lexical aspect are different from those of grammatical aspect.
Planned events can also be referred to using the present progressive (She is arriving tomorrow) or, if precisely scheduled, the simple present (She arrives tomorrow). The future progressive and future perfect can be used analogously to the past equivalents: We will be sitting on the beach this afternoon; We will have left the house by 4 o'clock.
The learning curve may refer to a specific task or a body of knowledge. Hermann Ebbinghaus first described the learning curve in 1885 in the field of the psychology of learning, although the name did not come into use until 1903. [4] [5] In 1936 Theodore Paul Wright described the effect of learning on production costs in the aircraft industry. [6]