A320. THE FOREIGN ATCT LCL CTLR WAS NOT ABLE TO COMMUNICATE WELL ENOUGH IN ENGLISH; WHAT HE WANTED DONE IN HIS CLRNC.

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WE WERE HOLDING BEHIND A B737; SHORT OF RWY 23R IN MMMX ON TXWY B6 AFTER LNDG ON RWY 23L. THE TWR SAID SOMETHING IN SPANISH; AND THE B737 STARTED TO MOVE ONTO RWY 23R. THE TWR THEN TOLD US TO FOLLOW WHAT WE HEARD HIM TO SAY; 'ACR X' DOWN RWY 23R AND EXIT AT B5 TO TXWY B. WE ASSUMED ACR Y HAD JUST LANDED ON RWY 23R; BUT DIDN'T SEE AN ACR X ACFT ANYWHERE. SO; WE ASKED THE TWR THE LOCATION OF THE ACR X; WE WERE INSTRUCTED TO FOLLOW. HE THEN SAID TO FOLLOW THE ACFT AHEAD ON RWY 23R; WHICH WAS AN ACR Z; B737. AS THERE WERE 2 ACR Z; A320'S ON TXWY B EITHER SIDE OF TXWY B5; IT LOOKED LIKE I COULDN'T EXIT RWY 23R THERE; AND THE B737 WE WERE INSTRUCTED TO FOLLOW HAD ALREADY PAST TXWY B5 AND WAS EXITING ON B3. I CONTINUED TO TAXI ON RWY 23R PAST B5 TO EXIT AT B3 ONTO TXWY B. TWR THEN ASKED US WHY WE PASSED TXWY B5; AND IT WAS ONLY THEN THAT I REALIZED THAT HE DIDN'T WANT US TO FOLLOW THE B737 TO B3. SUPPLEMENTAL INFO FROM ACN 617508: ONCE PARKED; AN ACR REPRESENTATIVE TOLD US WE HAD TO GO TO THE ARPT AUTHS. WE DID; ACCOMPANIED BY THE STATION MGR; FILLED OUT A RPT FOR THE INCIDENT.