Since

• Focuses on the starting point.

“I have been working here since 2011”.

For

• Focuses on the amount of time.

“I have been working here for 3 years”.

Activity

1. I have been working here for 7 years.
2. I have been working here since 2005.

What is the difference?

“I have been living in Colombia for 4 years”.

The person lives in Colombia now.

“I have been living in Colombia since 2017”.

The person lives in Colombia now.

“I lived in Colombia for 4 years”.

The person doesn’t live in Colombia anymore.

• How long have you been in your current job or school?