Question:
A person is more productive on an IDE than a text editor, therefore it should be used in general practice.

Who is it referring to in this sentence?
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Answer:
an IDE

Question:
Technician Stepanic crafted advanced opticals for Leforge since he needed to be able to see well for his duties.

Who is he referring to in this sentence?
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Answer:
Technician Stepanic

Question:
The professor told John that he passed him.

Who is he referring to in this sentence?
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Answer:
The professor

Question:
Lions love gazelles because they eat them.

Who is they referring to in this sentence?
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Answer:
Lions