Hi ,
My Batch class is not saving and giving m ethe follow errors need help please

Error1: Compile Error: S2S_PropogateParent: Class must implement the global interface method: Iterable<SObject> start(Database.BatchableContext) from Database.Batchable<SObject>,

Error 2 :S2S_PropogateParent: Class must implement the global interface method: void execute(Database.BatchableContext, LIST<SObject>) from Database.Batchable<SObject>,

Error 3 : S2S_PropogateParent: Class must implement the global interface method: void finish(Database.BatchableContext) from Database.Batchable<SObject> at line 1 column 14

global class S2S_PropogateParent implements Database.Batchable<sObject>  {

  global void execute(SchedulableContext SC) {

    S2S_Utils su = new S2S_Utils();

    // clear out previously completed records
    Datetime hourAgo = DateTime.now().addHours(-1);
    List<S2SParentPropogation__c> deleteNow = [SELECT Id FROM S2SParentPropogation__c WHERE Status__c = 'Completed' AND CreatedDate < :hourAgo];
    try {
      delete deleteNow;
    } catch (Exception e) {
      // meh, it was probably already deleted by another job running in parallel
    }

    /****************** Retrieve Data **********************/
    // what records are out there awaiting sync
    Datetime minsAgo = DateTime.now().addMinutes(-1);
    List<S2SParentPropogation__c> processNow =
      [SELECT LocalId__c, LocalAccountId__c, Status__c
      FROM S2SParentPropogation__c
      WHERE Status__c = 'Inserted'
      AND (JobID__c = 'DOH-testing' OR CreatedDate < :minsAgo)];

    // get list of accounts so we know which sync records to look for
    List<ID> localAccountIds = new List<ID>();
    for (S2SParentPropogation__c pp : processNow) {
      localAccountIds.add(pp.LocalAccountId__c);
    }

    // which of those accounts have completed sync?
    List<PartnerNetworkRecordConnection> findSynchedAccounts = su.findAlreadySynchedAccounts(localAccountIds);

    /****************** Add Sync Records **********************/
    List<PartnerNetworkRecordConnection> newSynchRecords = new List<PartnerNetworkRecordConnection>();
    for (S2SParentPropogation__c p : processNow) {

      // find corresponding account S2S sync record
      PartnerNetworkRecordConnection accountS2S = null;
      for (PartnerNetworkRecordConnection pn : findSynchedAccounts) {
        if (pn.LocalRecordId == p.localAccountId__c) {
          accountS2S = pn;
        }
      }

      // found it
      if (accountS2S != null) {
        // auto-share this contact/opportunity with the client org
        newSynchRecords.add(su.buildPartnerConnectionRecord(p.LocalId__c, p.LocalAccountId__c));
        p.Status__c = 'Completed';
      }
    }

    insert newSynchRecords;
    update processNow;

  }

}

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If i replace the first line with global class S2S_PropogateParent implements Schedulable { but if i use this i cannot schedule the batch class as it throws me an error Argument must be an object that implements Database.Batchable

Thanks
Akhil