present perfect continuous tense

I have been waiting for the job for two years.
i have been writing this blog for one month.
i have been teaching in this school since 8th, August 2007.
i have been reading this story since 4pm.
she has been waiting for bus since 5 O'clock.
he has been waiting for his wife for five years.

in persent perfect tense we have to note two things
one is "since"and 'for'
we use since at point of time and for at period of time.
second one is "have" and "has"
we use have to plurals and has to singulars.


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