Practical exercises and examples:
"Ma"
mangetsu, man-in, murasame, meigetsu, mensetsu, men-eki, mondai, monban, mamorigami, midashinami, miseinen, miyamairi, murasuzume, menkyosho, tamanegi
"Na"
nanten, ninso, ningyo, ninniku, nukarumi, nuimono, nenbutsu, norimono, nakineiri, nomimono, natsuyasumi, namakemono, nakineiri, naganegi, etc.
Students should be trained by a qualified instructor. At home, they should have family members listen to their speech and determine whether words are pronounced precisely, rather than relying only on their own ears.