42nd qs.

There are four persons A,B,C,D and for languages english ,french
,german
italian,
conditions
1 only one language is spoken by more than two men
2 A dont know english
3 a man can speak either french or german but not both
4 all man cannot spek in a group(no common language)
5 A can mediate when B and C want to speak with each other
6 each men can speak two languages