Someone asks us what our job is. What's the difference between these three answers?
I'm a secretary. I work in a dental office.
I'm a secretary. I'm working in a dental office.
I'm a secretary. I've been working in a dental office.
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Sign up to join this communityThis is a fact about the person. The see their job as permanent and don't expect to change it.
This describes their current position, with the implication that their position is temporary. "I'm working in a dentist's office, but I want to quit and start my own business"
This suggests that they no longer work in a dentist's office (perhaps they have recently quit their job to care for children etc) "I've been working in a dentist's office, but I left yesterday because I'm going to start my own business"
Perfect tenses have two main uses, depending on whether or not a "since" phrase is present.
"I've been working" speaks of an ongoing work in the past that is now completed but making a connection to the present. The nature of the connection is made clear by the context. Without context it sounds rather odd.
"I've been working since ..." means that the work is ongoing until the present and so isn't complete.