Parsa: When does a firefighter go to work?
Hamid: I think he goes to work on shift.
or
Hamid: I think he goes to work on shifts.
?
I would say "I think he works shifts", but in colloquial language people are more likely to talk about the general case in the plural: Parsa: When do firefighters go to work? Hamid: I think they work shifts. " may not be the best wording for the question.
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I would say "I think he works shifts", but in colloquial language people are more likely to talk about the general case in the plural:
Parsa: When do firefighters go to work?
Hamid: I think they work shifts.
"When do firefighters go to work?" may not be the best wording for the question. Do you want to ask
I wouldn't say your versions are wrong, but I usually hear this.
I think they work shifts.