INST PLT WITH STUDENT HAS PROB ON APCH WITH MISUNDERSTOOD CLRNC WHEN TURNING BASE AND OVERSHOT RWY CTRLINE ENCROACHING ON PARALLEL RWY APCH AREA.

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MY STUDENT; MR X; AND I WERE COMING BACK INTO SNA AFTER SOME INST TRAINING WHERE I WAS THE SAFETY PLT. WE WERE VMC WITH MR X FLYING THE ACFT. TWR INSTRUCTED US TO ENTER R TFC FOR RWY 19R AND WE DID SO. WE HAD TO CALL THE TWR TWICE TO RPT 'DOWNWIND' AND THEY SEEMED DISTRACTED AND BUSY. WHEN TWR CALLED US BACK THEY INSTRUCTED US TO 'EXTEND DOWNWIND; I'LL CALL YOUR BASE.' WE ACKNOWLEDGED. TWR THEN TOLD US TO TURN BASE AND WE DID. WE THEN RECEIVED ANOTHER INSTRUCTION THAT SOUNDED LIKE 'CONTINUE STRAIGHT.' SINCE WE WERE ON BASE THIS DIDN'T SOUND RIGHT BUT MY STUDENT ACKNOWLEDGED THAT WE WOULD CONTINUE STRAIGHT (ON BASE) AND WE DID. THIS RESULTED IN US FLYING OVER INTO THE PATTERN FOR RWY 19L. TWR THEN CALLED AND COMPLAINED THAT WE WERE FAR L OF CTRLINE AND ASKED IF WE HAD THE ARPT IN SIGHT. WE REPLIED THAT WE DID AND EXECUTED A SHARP CORRECTING TURN AND LANDED RWY 19L WITHOUT INCIDENT. GND TOLD US TO CALL TWR ON LAND LINE. I CALLED AND EXPLAINED THAT WE HAD HEARD 'CONTINUE STRAIGHT' WHILE WE WERE ON BASE; TWR SAID; THANK YOU; AND NO PROB.