A MISCOM AT A FOREIGN ARPT LEADS TO THE XING OF THE OVER-RUN AREA OF THE RWY WITH AN ACFT IN POS FOR TKOF.

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NBOUND ON TXWY G AT GRU; AFTER LNDG AND ROLLOUT ON GRU RWY 27L; WE WERE CLRED TO EXIT AND TAXI NBOUND ON TXWY G AND STAY WITH THE TWR. I HEARD NO HOLD SHORT INSTRUCTIONS FOR US; ALTHOUGH THERE WAS SOME CHATTER ON FREQ IN PORTUGUESE. THERE WERE NO ACFT IN POS AND HOLD ON RWY 27R AT THAT TIME. TXWY G DOES NOT CROSS RWY 27R ITSELF; BUT DOES CROSS ITS EXTENDED CTRLINE ON A STOPWAY FOR RWY 27R. JUST AS WE WERE ABOUT TO CROSS INTO THE STOPWAY; A B737 TAXIED ONTO RWY 27R WITH HIS TAXI LIGHT ON. AS WE CONTINUED INTO THE STOPWAY; TWR CALLED US AND TOLD US TO STOP; THAT THERE WAS DEPARTING TFC ON RWY 27R. WE COULD NOT STOP WITHOUT BLOCKING THE STOPWAY; SO CONTINUED ON PAST THE STOPWAY AND HALTED. TWR ASKED US IF WE HAD NOT 'SEEN THE LIGHTS'. WE ASSUMED HE MEANT THE DEPARTING ACFT'S LIGHTS; AND TOLD HIM THAT WE HAD SEEN HIS TAXI LIGHT ONLY; AND THOUGHT HE WAS POS AND HOLD ON RWY 27R; WAITING FOR US TO GET ACROSS THE STOPWAY. AFTER ARR; I DISCUSSED THIS INCIDENT WITH THE TWR; EXTENDED MY SINCERE APOLOGIES; AND REQUESTED THAT I BE ALLOWED TO DISCUSS THE INCIDENT WITH THE TWR CHIEF. I EXPRESSED MY APOLOGIES FOR APPARENTLY MISSING AN AMPLIFYING HOLD SHORT CLRNC; WHICH NONE OF THE 3 PLTS IN THE COCKPIT AT LNDG HAD CAUGHT. HE SAID THAT THEIR PROCS WERE TO FILE A RPT ONLY IN CASE OF AN INTL CREW FROM A NON-PORTUGUESE-SPEAKING NATION HAVING AN ATC MISCOM.