A B767 FLC TAXIES ONTO A RWY AT CDG BECAUSE THEY THOUGHT THEY HAD RECEIVED CLRNC TO 'LINE UP AND WAIT.' 2 ACFT EXECUTED GAR'S BECAUSE OF THEIR RWY INCURSION.

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DURING TAXI OUT TO RWY 9 IN CDG; CAPT BELIEVED THAT HE HEARD A CLRNC TO 'FOLLOW ACR X INTO POS.' CAPT DIRECTED FO TO RESPOND TO THE CLRNC AND HE DID SO SAYING 'ROGER; ACFT XXXX; CLRED TO FOLLOW ACR X INTO POS.' AFTER ACR X FLT WAS CLRED FOR TKOF; WE TAXIED INTO POS ON THE RWY. CDG TWR CLRED AN ACFT TO LAND WHO QUESTIONED TWR ABOUT THE ACFT ON THE RWY. CDG TWR ASKED US IF WE WERE IN POS ON THE RWY AND WE ANSWERED IN THE AFFIRMATIVE. CDG TWR STATED THAT HE HAD NOT CLRED US ONTO THE RWY AND FOR US TO STAND BY. CDG TWR GAVE THE ACFT ON FINAL GAR INSTRUCTIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE HEARD THE CLRNC TO LINE UP AND WAIT BEHIND ANOTHER ACR. AFTER THAT ACR STARTED HIS TKOF ROLL; RPTR TAXIED ONTO THE RWY. HE KNEW OTHER ACFT WERE ON FINAL APCH; BUT ASSUMED HE WOULD BE GIVEN TKOF CLRNC TIMELY ENOUGH SO THERE WOULD BE NO CONFLICT FOR THE APCHING ACFT. WHEN APCHING ACFT INQUIRED ABOUT HIS ACFT ON THE RWY; THE TWR STATED THAT CLRNC ONTO RWY HAD NOT BEEN ISSUED. YET; THE CAPT IS POSITIVE CLRNC WAS ISSUED TO 'LINE UP AND WAIT.' FURTHERMORE; THE CAPT STATED THAT THE TWR CTLR SEEMED TO BE CONFUSED. MOSTLY BECAUSE THE TKOF CLRNC COULD HAVE BEEN ISSUED EARLIER OR THE ACFT ON APCH COULD HAVE BEEN GIVEN GAR INSTRUCTIONS EARLIER IF THERE WAS GOING TO BE A LOSS OF SEPARATION. RPTR FELT THAT THERE WAS NO LANGUAGE BARRIER; CTLR ENGLISH WAS VERY UNDERSTANDABLE. SUPPLEMENTAL INFO FROM ACN 421662: BUT WORKLOAD WAS HIGHER THAN NORMAL. AS WE SWITCHED TO TWR 119.25; WORKLOAD WAS JUST BACK TO NORMAL AND THE CAPT TOLD ME TO RESPOND; FOR HE THOUGHT THAT WE HAD RECEIVED CLRNC TO FOLLOW ACR X ONTO THE RWY AND ALIGN UP. AN ACFT ON FINAL TO RWY 9 ASKED THE TWR ABOUT THE ACFT ON THE RWY WHEN CLRED TO LAND. TWR TOLD HIM TO GO AROUND;' AND TWR ASKED US IF WE WERE IN POS ON THE RWY. WE RESPONDED THAT WE WERE ON THE RWY. WE WERE TOLD TO 'STAND BY; 2 ADDITIONAL ACFT WERE TO 'GO AROUND.' TWR THEN CLRED US FOR TKOF. EUROPEAN CLRNCS CAN BE VERY MISLEADING! SOMETIMES WE HAVE BEEN CLRED ONTO THE RWY BEHIND LNDG TFC 3 MI OUT OR MORE. SOMETIMES WE HAVE BEEN CLRED TO ALIGN UP AND WAIT WHEN #3 IN TKOF LINE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT BECAUSE OF PRE TKOF DUTIES HE WAS NOT ABLE TO HEAR ANY CLRNC TO TAXI ONTO THE RWY. BEFORE THE CAPT TAXIED ONTO THE RWY; RPTR INQUIRED OF THE CAPT; 'DID YOU RECEIVE CLRNC TO TAXI ONTO THE RWY; BECAUSE I DID NOT HEAR ANY SUCH CLRNC;' TO WHICH THE CAPT REPLIED THAT HE HAD RECEIVED THE CLRNC. AT THAT TIME; THE RELIEF PLT MENTIONED TO THE RPTR THAT HE NEVER HEARD ANY CLRNC TO GO ONTO THE RWY EITHER. RPTR FEELS BAD THAT HE DID NOT CALL THE TWR TO CONFIRM THE CLRNC. RPTR HAS GREAT TRUST AND CONFIDENCE IN THE CAPT AND THAT IS THE REASON WHY HE NEVER FOLLOWED UP WITH A CALL TO THE TWR TO VERIFY INSTRUCTIONS. RPTR FEELS THAT ICAO RWY TERMINOLOGY CAN BE CONFUSING; SUCH AS CLRNC TO TAXI ONTO A RWY MAY BE GIVEN WHEN WAITING AS #3 FOR TKOF. HE SUSPECTS THAT MAY BE THE CASE IN THIS SIT. THE CLRNC WAS GIVEN SO EARLY THAT HIS PRE TKOF DUTIES DISTR HIM FROM LISTENING CLOSELY TO ALL INSTRUCTIONS. FURTHER; RPTR STATES THAT THE LANGUAGE WAS NOT A BARRIER; ENGLISH WAS WELL SPOKEN.