Saving an address in advance prepares for a possible loss of signal. Checking the saved address if the signal fails is a response to that event. The two actions have different timing.

The idea

Use in case + clause for the possibility motivating a precaution. Present forms can refer to a future risk; past forms can explain an earlier precaution. Just in case can stand alone. In case of + noun is common in instructions.

Examples

  • I'll save the address offline in case my phone loses its signal.
  • Pack a spare shirt in case the paint splashes.
  • I wrote down the shelf measurements in case I forgot them.
  • Keep the order number, just in case.
  • In case of a delay, contact the workshop organiser.
  • I'll check the offline address if I lose the signal.

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Watch out

Do not mechanically substitute if: a precaution does not wait for the problem. It need not prevent the event either—a spare shirt does not stop splashes. In the notice, in case of a delay means if a delay occurs.

Try it yourself

  1. Choose the correct form. I'll save the address offline in case my phone ___ its signal. (loses / lose)

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    loses

    Singular my phone takes loses. The present form refers to a possible later loss of signal.

  2. The address is saved beforehand as a precaution. Choose the matching phrase. I'll save it ___ I lose the signal. (in case / only if)

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    in case

    In case matches advance preparation. Only if would make saving the address conditional on losing the signal.

  3. Choose the correct phrase before a noun. ___ a delay, contact the organiser. (In case of / In case)

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    In case of

    Use in case of before the noun phrase a delay. Without of, a clause would be needed, such as there is a delay.

Use it today

Write two linked instructions for a trip: one precaution with in case and one response with if. Explain which action happens before any problem and which depends on it.