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The present perfect is a grammatical combination of the present tense and perfect aspect that is used to express a past event that has consequence in present. [1] The term is used particularly in the context of English grammar to refer to forms like "I have finished".
The basic (present) perfect form, with the auxiliary in the present tense, may specifically carry the meaning of perfect aspect, as in English; however in some languages it is used more generally as a past tense (or preterite), as in French and German. The use of auxiliaries and meaning of the constructions in various languages are described below.
It is formed with the present tense of the auxiliary have (namely have or has) and the past participle of the main verb. The choice of present perfect or past tense depends on the frame of reference (period or point in time) in which the event is conceived as occurring. If the frame of reference extends to the present time, the present perfect ...
Isaac Newton was born (according to the Julian calendar in use in England at the time) on Christmas Day, 25 December 1642 (NS 4 January 1643 [a]) at Woolsthorpe Manor in Woolsthorpe-by-Colsterworth, a hamlet in the county of Lincolnshire. [27] His father, also named Isaac Newton, had died three months before.
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. [2]
The quote is most often attributed to Sir Isaac Newton in a letter to his rival, Robert Hooke. Isaac Newton remarked in a letter to his rival Robert Hooke written in 5 February 1675 and published in 1855: What Des-Cartes did was a good step. You have added much several ways, & especially in taking the colours of thin plates into philosophical ...
1666–1675: Theories on optics proposed by Sir Isaac Newton (1642–1726/7); Newton published Opticks in 1704. 1687: Law of universal gravitation formulated in the Principia by Sir Isaac Newton (1642–1726/7). 1687: Newton's laws of motion formulated in the Principia. 1800: Infrared radiation discovered by Sir William Herschel (1738–1822).
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