sam has been talking on the phone for an hour
could you please expaline me the verb tense here is it present perfect
i need every thing about this tense
if I say
sam is talking on the phone for an hour
is it correct and why?
what is the difference between two sentences?
The first is correct- it shows that he started talking an hour ago and is talking now. The second is incorrect because the present progressive would be used to say that he is on the phone now but not for how long.