Simple: to have + III form
1.an indefinite action performed in the past
Eg: I have seen him. We have met.
2.an action performed in the past with results and 11211b11l authors in the present
Eg: He has lost his umbrella and he will get wet to the skin.
I have not studied this rule and I don't know how to do this exercise.
3.an action performed in an unfinished period of time: lately, recently, this week, this month, today.
Eg: I have been very busy today.
Tom has studied a lot this month.
4.a repeated action from the past to the present
Eg: He has always helped me in difficult moments.
They have usually met at school.
5.an action started in the past and continued in the present: for, since
Eg: He has studied in this school for five years.
We have been mates since I moved in this class.
Continous: to be (present perfect)+vb inf
1.a continous action from the past in the present: for, since
Eg: He has been studying for two hours.
We have been waiting for you since morning.
2.a repeated action from the past to the present with instantaneous verbs
Eg: My neighbour has been hammering since five o'clock and I have a terrible headache.
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