English for Today by Ganiu Abisoye Bamgbose (Dr GAB)
IF or WHEN?
I have to go to work now. I’ll see you ~if~ I’m back (nonstandard).
I have to go to work now. I’ll see you *when* I’m back (standard).
The use of “if” in this context suggests uncertainty which is inappropriate. Use “when” to mean “at a later time”.
I will give him the prize ~when~ he wins the debate (nonstandard).
I will give him the prize *if* he wins the debate (standard).
“If” should be used when there is a condition for an action to take place.
GAB
No comment