Which of the following sentences is grammatically correct? and why?
The project will be completed within next few days.
The project will be completed within few next days.
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.Sign up to join this community
Both expressions don't sound English. I would go with:
The project will be completed within a few days.
So without the next. Since you say will be, it implies the action will take place in the future.
Alternatively you could say:
The project will be completed within the next few days.
So with a the.