Present Perfect Continuous – How long

We use the present perfect continuous when an action started in the past and is continuing.

I’ve been teaching English for 15 years.

Look at the construction:

Subject	to have	been	-ing form of verb
I	have	been	living	abroad for 20 years.
They	have	been	going out together	for 3 years.
She	has	been	studying English	since she was a child.

For and Since

For + a number	Since + a date or time
for 3 weeks for 8 days for 20 hours	since Tuesday since 1990 since I was born

We say for + a number

Examples

She’s been working for three weeks.
He’s been sleeping for eight hours.
I’ve been waiting for two hours.

We say since + a date or time

Examples

She’s been here since Tuesday.
He’s been doing this job since 2000.
I’ve been playing football since I was 5.