if vs in case — same-chain vs pre-emptive precaution (GiU Unit 114)
The frame
Section titled “The frame”This book belongs to Susan. Can you give it to her if you see her? ✓
Giving happens at the moment of seeing = same chain → if. ✗ in case (you can’t hand over the book before seeing her).
The split
Section titled “The split”| if | in case | |
|---|---|---|
| Link | X happens → then Y (same chain) | Y done now as preparation for possible X |
| Certainty of X | treated as the condition | X may never happen |
| Timing of Y | at X | before X, pre-emptive |
| Example | Give it to her if you see her | Take an umbrella in case it rains |
The pre-emptive test
Section titled “The pre-emptive test”Can I do the main action BEFORE the case happens, as insurance?
- Yes → in case: take/bring/leave/save/write down/carry + in case
- No (action only possible at that moment) → if
Real in-case verbs: take an umbrella, bring a spare key, leave a note, save the file, write down the address.
JP mirror
Section titled “JP mirror”もし〜たら = if. 〜に備えて / 〜かもしれないから = in case.
Source
Section titled “Source”Raymond Murphy, English Grammar in Use, Unit 114 — in case. Ebot lesson 2026-09-05.