shravanmm I am calling you since morning Hi, This is incorrect because the phrase " since [this] morning " can not be used with present progressive form of a verb.. In American English, when we contact someone by phone, the normal utterance is "calling". " meaning at this minute you are contacting your friend by phone.
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shravanmm I am calling you since morningHi,
shravanmmAre both sentences correct?Only #2 is correct (have been).
CliveI have been calling you since this morning.I would say this, too, but the sentence is natural even without a determiner.
shravanmmI am telephoning my friend since morning.Use this: I have been calling my friend since this morning.