OOВ Justin (cook) dinner for two hours now!
Maryalready(buy) a present for her mum.
They(plan) their holiday for the last two weeks
I (eat) a sandwich. I'm not hungry.
My sister (study) playing the piano since six years old.

Justin has been cooking dinner for two hours now!

Mary has already bought a present for her mum.

They have been planning their holiday for the last two weeks

I ate a sandwich. I'm not hungry.

My sister has been studying playing the piano since six years old.

justin has been cooking dinner for two hours now

mary has already bought a present for her mum

they have been planning their holiday for the last two weeks

i ate a sandwich. I'm not hungry

my sister has been studying playing the piano since six years old