IN: Which person is it?
A person is more productive on an IDE than a text editor, therefore it should not be used in general practice.

OPTIONS:
- an IDE
- a text editor
OUT: a text editor

IN: Which person is they?
The heavy weapons team bombarded the settlement with their mortars even though they were unarmed.

OPTIONS:
- The heavy weapons team
- the settlement
OUT: the settlement

IN: Which person is he?
The judge was fond of the contestant so he voted favorably.

OPTIONS:
- The judge
- the contestant
OUT: The judge

IN: Which person is they?
The ski instructors taught the children the basics of skiing because they have much experience to share and teach.

OPTIONS:
- The ski instructors
- the children
OUT:
The ski instructors