1. used to introduce the first of two or more alternatives
Usage: often followed by ‘or’
2. used to express doubt or choice between alternatives
Usage: can be used without ‘or’ when alternatives are implied

Examples

• I don’t know whether to laugh or cry.
• She asked whether we wanted pizza or pasta for dinner.
• Whether you like it or not, we have to leave now.
• The question is whether he will accept the job offer.
• I’m not sure whether she’s coming to the party.
• Whether by accident or design, the plan worked perfectly.
• We need to decide whether to drive or fly to the conference.