essential2004..... I s there a situation in which either present perfect or simple past can be used ? Yes, many times either one can be used.
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essential2004.....Is there a situation in which either present perfect or simple past can be used? Yes, many times either one can be used.
I (have received)(received) your letter of October 19th.
Tom (has broken)(broke) his ankle.
essential2004... is there a situationYes. There are thousands and thousands of cases like that. It is the speaker's choice whether to present the infthatin which we can usebotheither the present perfect or simple past?
essential2004but is it up to me to use what I want in all situations ? no1) When you are describing a present situation, you have to use present perfect.
or there are situations we can't use the other Yes, see the examples below, which show two major differences in the use of the two tenses.
canadian45'I have studied English for two years.' You say that when you are still studying English.Not necessarily.
canadian45....'I have studied English for two years.' You say that when you are still studying English.I think that the underlined is only one of the certain ways.
Aspara Gus...Not necessarily.For certainty, you'd needI have been studying English for two years.
canadian45I believe that 'I have studied English for two years.' is very widely accepted as meaning that you are still studying, as opposed to 'I studied English for two years.'Yes, many might take it to mean that, but the progressive form leaves no doubt.