1.Mary has gone to school already.
Has Mary gone to school?--Yes,she has./No,she hasn't.
Mary hasn't gone to school.
2.Jim has lived in London already.
Has Jim lived in London?----Yes,he has./No,he hasn't.
Jim hasn't lived in London.
3.I have run since 2000.
How long time have you run?----Since 2000.
I havn't run since 2000.
4.I have taught in this school for 3 years.
How long have you taught in this shcool?For 3 years.
I have'taught in this school for 3 years.