Editing Polivanov system (section)

==Diphthongs==
It is permitted to use й instead of и in diphthongs (e.g. ''shinjit<u>ai</u> → синдзит<u>ай</u>'', ''s<u>ei</u>nen → с<u>эй</u>нэн''). However, ''и'' is always used on a morpheme clash: ''Kaw<u>ai</u> (kawa + i) → Кав<u>аи</u>''.

Yevgeny Polivanov recommended (but not prescribed as mandatory) to use ''й'' for Sino-Japanese (''on'yomi'') words, and ''и'' for native Japanese (''kun'yomi'') words. Another Polinanov's recommendation is to spell the diphthong ''ei'' as a long vowel ''э:'', but this recommendation is almost never followed in practice. Instead, long vowel ''ē'' in the name ending ''-bē'' is often transliterated as ''-эй'', e.g. ''Gonb<u>ē</u> → Гомб<u>эй</u>.''