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0Do "so far, to date, up to now, up to present" have the same meaning. if they mean from the past to now,include now this moment, so they are durations? if so, then can we use those phrases in the sentence of present perfect tense and past tense or any other tenses? 02br
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00"01i00I have written six letters all morning" 02i00and01i00 "I have been writing six letters all morning" 02i00if01i00 02i00 Writing 01b00six02b00 letters is an accomplishment that can't happen all morning.,Both sentences can't work, because not only the usage of present perfect continuous tense(second one) is Actions which started in the past and are still continuing, present perfect tense(first one) also has this usage (depends on the context) , (notice in those sentences,suppose it is 9:00 A.M now,it is still morning,not finished---according to the usages of this tense). Thanks for replying!0-