Present Perfect to Express Duration
When an action begins in the past and continues into the present moment we use the present perfect. The present perfect expresses duration over time FROM the past moment TO the present moment.
Use the auxiliary of helping verb 'to have' to form the Present Perfect.
I have lived in Argentina for five months. (I began living in Argentina and to this day it has been five months). See the connection of the past to the present? That's the present perfect!
He has lived in the city since 1998.
They have worked at that company since last April.
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