In Urdu, in is commonly rendered “if” and idha “when”; similar shorthand exists in English. Such glosses are useful but cannot convey every rhetorical purpose.
إِنْ جِئْتَ أَكْرَمْتُكَ
If you come, I shall honor you.
إِذَا جِئْتَ أَكْرَمْتُكَ
When you come, I shall honor you.
The second presents the coming as more expected. But when in serves a rebuke or a counterfactual argument, a literal “if” translation needs additional explanation.