DC9 CREW HAD RWY INCURSION AT CYUL.

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WE WERE TAXIING TO RWY 6R TALKING TO APRON CTL AND WAS TOLD TO TAXI INTO THE R BAY (IE; THE TXWY JUST SHORT OF RWY 6R) AND CONTACT GND ON 121.9. WE CONTACTED GND AND THEY SAID 'RWY HEADING ? (INAUDIBLE)' I ASKED THEM TO SAY AGAIN. THEY SAID 'RWY HEADING RTE? UNCHANGED.' THERE WAS A LONG PAUSE; IN WHICH WE THOUGHT GND WAS ALSO CTLING TWR CTL. WE STARTED TO TAXI PAST THE FIRST HOLD SHORT LINE. GND CTL TOLD US TO CONTACT TWR ON 119.9. WHEN WE CHANGED TO TWR CTL WE STOPPED AND I STARTED TRYING TO GET TWR ON THE RADIO. TWR WAS TRYING TO GET US ON THE RADIO. WE WERE STEPPING ON EACH OTHER. FINALLY TWR ASKED IF WE WERE ACROSS THE YELLOW LINE. I SAID YES. THERE WAS AN ACFT ON APCH THAT HAD JUST BROKEN OUT OF THE CLOUDS AND THE TWR TOLD THE ACFT (IN FRENCH) TO GO AROUND. WE THEN WERE CLRED INTO POS AND CLRED FOR TKOF. 1) THE PROB AROSE WHEN THERE WAS CONFUSION WITH THE GND CTLR. THE FRENCH ACCENT AND THE USE OF NON STANDARD TERMS (IE; RWY HEADING; THEN A LONG PAUSE) 2) ANOTHER PROB IS 2 HOLD SHORT LINES. AFTER WE CALLED THE SUPVR ON THE TELEPHONE HE TOLD US THAT LINE IS FOR GND VEHICLES. WHEN GND CTL TOLD US THE INSTRUCTIONS IT GAVE US THE THOUGHT OF; 'THAT IS OUR TKOF CLRNC.' WE NEVER DID ENCROACH UPON THE RWY. WE CALLED MONTREAL'S SHIFT SUPVR WHEN WE LANDED. HE SAID THAT HE UNDERSTOOD THE CONFUSION ACCORDING TO THE TAPES THAT HE REVIEWED; AND THAT IT HAS CAUSED CONFUSION IN THE PAST. HE SAID THAT HE UNDERSTOOD WHY WE ASKED GND CTL TO REPEAT THE INSTRUCTIONS; AND EXPLAINED THE REASON FOR TWO HOLD SHORT LINES. HE SAID NOT TO WORRY ABOUT IT AND WE TOOK WHAT HE SAID AS NO FOLLOW UP ACTION NECESSARY. HUMAN FACTORS: 1) POOR COM SKILLS OF GND CTLR WITH FRENCH ACCENT AND NON STANDARD PHRASEOLOGY. 2) NON STANDARD ARPT MARKINGS. 3) PLTS SHOULD QUERY WITH GND CTLR TO BE MORE SPECIFIC ON INSTRUCTIONS. ACTIONS TO PREVENT A RECURRENCE: STANDARD LANGUAGE AND PHRASEOLOGY.