I haven't (known/ been knowing/ both) him for very long.
known
They have (owned/ been owning/ both) this house for ten years.
owned
He has always (liked/ been liking/ both) chocolate ice cream.
liked
I haven't (spent/ been spending/ both) enough time with my family.
both
She hasn't (slept/ been sleeping/ both) well in the last 3 days.
both
She has (studied/ been studying/ both) for her exams all week.
both
They have (travelled/ been traveling / both) around Europe this summer.
both
I have (learned/ been learning/ both) to play the piano recently. I am still learning.
been learning
We have (renovated/ been renovating / both )our house for months. We haven't finished yet.
been renovating
The car has (belonged/ been belonging/ both) to him since he was a teenager.
belonged
