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Unlike the present perfect, the past perfect can readily be used with an adverb specifying a past time frame for the occurrence. For example, it is incorrect to say * I have done it last Friday (the use of last Friday , specifying the past time, would entail the use of the simple past , I did it , rather than the present perfect).
The past perfect progressive (sometimes referred to as the past perfect continuous) combines had (the simple past of have) with been (the past participle of be) and the present participle of the main verb: You had been waiting. It is used to refer to an ongoing action that continued up to the past time of reference.
The simple past is often close in meaning to the present perfect. The simple past is used when the event is conceived as occurring at a particular time in the past, or during a period that ended in the past (i.e. it does not last up until the present time).
For past actions or states, the simple past is generally used: He went out an hour ago; Columbus knew the shape of the world. However, for completed actions for which no past time frame is implied or expressed, the present perfect is normally used: I have made the dinner (i.e. the dinner is now ready).
The United States Food and Drugs Administration is warning pet owners about a common medication given to pets to treat arthritis. The F.D.A. now says that the drug Librela may be associated with ...
The implications of the present perfect (that something occurred prior to the present moment) are similar to those of the simple past. The simple past is generally used when the occurrence has a specific past time frame – either explicitly stated (I wrote a book in 1995; the water boiled a minute ago), or implied by the context (for example ...
The IMF on Thursday said its executive board completed the first review of an extended fund facility for Ecuador, allowing for an immediate disbursement of around $500 million. In a statement, the ...
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