Yes! Most fortunately i did!
Ndani Tanzania?? Where is the in word
Isn't a preposition missing?
kwa bahti, ulijifunza kiswahili NDANI Tanzania?
no, for proper noun places and times, prepositions like 'in' and 'to' are not needed e.g. anaenda Nairobi or 'tutarudi Krismasi*
And to say 'Tanzanian Swahili' (as I first supposed the phrase is translated) we would use 'cha', right?
Kwa bahati, ulijifunza Kiswahili cha Tanzania.
To say Swahili from Tanzania one would say Kishwahili ya Tanzania?
yes, or 'Kiswahili kutoka/toka Tanzania'