FLT INSTRUCTOR ENTERED CAT B AIRSPACE WITHOUT CLRNC WHEN DISTRACTED BY FOREIGN LANGUAGE ARGUMENT BTWN HIS STUDENT AND PAX.

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I WAS SCHEDULED TO FLY WITH A GERMAN STUDENT IN THE BEECHCRAFT DUCHESS. HE HAD FLOWN BEFORE IN THE UNITED STATES AND NEAR THE CLASS B AIRSPACE. THE GERMAN MAN SPOKE SOME ENGLISH; BUT HIS WIFE; WHO WAS IN THE BACK SEAT DIDN'T. I ASKED FOR CLRNC THROUGH THE AIRSPACE; BUT WAS TOLD TO STAY CLR OF CLASS B AND EXPECT ADVISORIES. I STAYED AT 1500 FT MSL AND DECIDED TO GO N UP THE VFR CORRIDOR. AS I WAS TALKING WITH APCH AND NAVING; THE GERMAN COUPLE STARTED A HEATED DISCUSSION IN GERMAN. HEATED ENOUGH TO DISTRACT ME. I SAW THAT WE WERE HEADING N TOO EARLY; SO I TOOK THE CTLS AND SET A HEADING TO THE ESE TO STAY S OF THE CLASS B. I EXPLAINED TO MY STUDENT THAT WE DIDN'T HAVE CLRNC AND WE CAN'T GO THAT WAY. I EXPLAINED CLASS B AND SHOWED HIM THE BORDERS. AFTER WE PASSED THE FIX ON THE R WE TURNED N UP THE CORRIDOR. CTLR ADVISED US OF A B777 AT 3000 FT; WE HAD IN SIGHT. I WAS GETTING FLUSTERED WITH THE GERMANS; RADIO CALLS; AND NAVING; AS WELL AS SUPERVISING THE FLT CTLS. WHEN I FOUND WHERE WE WERE ON THE CHART I CHKED THE DME AND SAW I WAS 6 MI NOT THE 7 MI TO STAY CLR. I WAS WAITING FOR A SPOT ON THE RADIO TO ADVISE. I SAW A JETSTREAM COMING; WELL CLR; BUT COMING. I CHOSE TO HOLD HEADING AND ALT TO NOT CREATE A WORSE SIT. I TOOK THE CTLS A SECOND TIME; BECAUSE MY STUDENT WASN'T COMPLYING WITH MY VECTORS. CTLR CALLED WITH A PHONE NUMBER AND A VECTOR TO GET US BACK TO THE CORRIDOR. I WAS ADVISED OF THE JETSTREAM WHICH HAD ALREADY PASSED BY. I THEN STAYED IN THE CORRIDOR FLEW N AND E AROUND AND BELOW CLASS B. I BELIEVE THE LANGUAGE BARRIER AND THE FACT THE STUDENT WAS ARGUING WITH HIS WIFE DISTRACTED ME AND HIM. ALSO; I FEEL I GAVE THE STUDENT MORE CREDIT THAN I SHOULD HAVE ABOUT HIS CLASS B KNOWLEDGE. WITH THE HIGH WORKLOAD OF SUPERVISING THE FLT CTLS; TALKING TO APCH; NAVING; LOOKING FOR TFC; AND TEACHING; I FELL A STEP BEHIND AND LOST CTL OF THE SIT. I HAVE BEEN WORKING THE LAST 2 WKS STRAIGHT. USUALLY I GET 1 DAY OFF A WK AND HOLD AT LEAST 10 HR SCHEDULED DAYS WITH FLTS; GND; AND SIMULATOR TRAINING. THAT DAY I FLEW 5 HRS ALREADY. SO FATIGUE ON MY PART IS A CAUSE OF THE PROB. TO CORRECT THIS FROM HAPPENING AGAIN; I HAVE TAKEN 2 DAYS OFF A WK IN JULY AND SHORTENED SOME OF MY DAYS. I WILL NOT TEACH BRAND NEW; FOREIGN STUDENTS CLASS B AIRSPACE BY GOING UP A CORRIDOR. I WILL STAY CLR AND GET FLT FOLLOWING. I WILL TAKE THE CTLS MORE OFTEN AND STRESS THE IMPORTANCE OF THE SIT; WHATEVER IT MAY BE; MORE OFTEN TO SET A GOOD EXAMPLE.