Requirement:
Write a Trigger on Employee custom Object -> The requirement is that the trigger should prevent Delete operation on Employee custom Object if a particular field(i.e., canDelete__c) is not checked.
Solution:

trigger DeleteEmployeeTrigger on Employee__c (before delete) {
   if(Trigger.isDelete){
      for(Employee__c anEmployee : Trigger.old){
         if(!anEmployee.canDelete__c){
             anEmployee.addError(‘Cannot delete Employee: ‘ + anEmployee.First_Name__c + ‘ ‘ + anEmployee.Last_Name__c);
         }
      }
   }
}