“Tell me if you can come.”
Grammar Entry 675 / 1011 60-second read
If (whether) vs. Whether
Formal writing prefers WHETHER.
The comparisoni
“Tell me whether you can come.”
The ruleii
¶
Formal: WHETHER for yes/no.
IF expresses a condition. WHETHER introduces alternatives. Both are used conversationally.
Memory aidiii
Remember it like this
Formal = whether.