Does

[hardy]

Dear Teacher,

Will you please explain that when we should use 'does' or 'is' in questions reffering to singular person. Below are correct examples I have taken from a book but I am confused why they are correct?

Does a geometrician work with mathematics?

Is a metronome used in the study of mathematics?

Please explain in an elaborated way.

Regards,

Hardy

[svartnik]

Originally Posted by hardy

Dear Teacher,

Will you please explain that when we should use 'does' or 'is' in questions reffering to singular person. Below are correct examples I have taken from a book but I am confused why they are correct?

Does a geometrician work with mathematics?

Is a metronome used in the study of mathematics?

Please explain in an elaborated way.

Regards,

Hardy

to work
to be used

What are the first finite verbs (verb that changes form) in the verb phrases?
Work and be respectively.
He works. 'Work' is a main verb. It means, when forming a question, use the 'do' auxiliary.
Does he work?

It is used.
The first finite verb is the auxiliary 'be' in 'is' form. This form of 'be' goes to the beginning of the sentence when forming a question.
Is it used?

[hardy]

Thank you Svartik for answering my querry in so simple and clear way.

[Casiopea]

Welcome, hardy.