Question

John.....in hospital for two weeks(meaningful expression)

Answer 1

Was admitted. hope it helps u

Answer 2

John was in hospital for two weeks.

It is the past tense first- and third-person singular.

Since, John has been in the hospital for two weeks then entire meaning would be in the form of past tense.

Two weeks from the till date is far so that they are prescribed in this format.

John was in hospital for two weeks is the correct answer.