1) .....am a doctor.
I am a doctor.
2) .....are students.
We are students. / They are students.
3) ....is a nice story.
It is a nice story.
4) .....is a clever man.
He is a clever man.
5) .....often come to school at 8 o'clock.
We often come to school at 8 o'clock. / They often come to school at 8 o'clock.