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Should I use in or on? Or are both okay?

A: I’ll be here for six weeks and I’m already in my second week.

B: I’ll be here for six weeks and I’m already on my second week.

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The choice of preposition is likely to depend on the expression or the context.

For example, one is generally:

in one's first year at university
in one's second month of training
in one's first week at college
in time to write the exam

but

in / on time for the appointment
on a week's holiday
on a year's sabbatical
on a few days' leave

There is no fixed rule regarding in or on. At times either may be acceptable; at others the expression, context or idiom dictates the choice.

In answer to your question, you are more likely to be on a course in your second week

  • on a course? I don't get that part, and it's not in the OP's sentence. (I assumed it was an internship or something.) – J.R. Sep 21 at 0:03
  • @J.R. It was my attempt to illustrate how both on and in could feature in the sentence. – Ronald Sole Sep 21 at 9:45
  • "on a course" doesn't sound idiomatic; I'd say, "I am in a course in my second week." – J.R. Sep 21 at 11:50
  • Google Books Ngram Viewer gives it to on by a nose although in was preferred historically. books.google.com/ngrams/… – Ronald Sole Sep 21 at 12:15

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