“Please make a decision (about)/(on)/(as to) whether we should stop.”
Is this sentence correct?
yes. They are all common variations. ‘on’ is the least formal and ‘as to’ is probably the most formal.
“Please make a decision (about)/(on)/(as to) whether we should stop.”
Is this sentence correct?
yes. They are all common variations. ‘on’ is the least formal and ‘as to’ is probably the most formal.