I taught here last year
==I have been teaching here since last year.
He began to make model planes when he was seven
==He has been making model planes since he was seven.
they moved here in 1993(live)
==They have been living here since 1993.
Bill began to talk on the phone five minutes ago
==BIll has been talking on the phone for five minutes.
My sister is playing with her dolls (three hous)
==My sister has been playing with her dolls for three hours.