For other finals formed by the suffix -r, pinyin does not use special orthography; one simply appends r to the final that it is added to, without regard for any sound changes that may take place along the way.
Para outras finais formadas polo sufixo -r, o pinyin non utiliza unha ortografía especial; simplemente anexa –r ao final ao que se engade, sen ter en conta as mudanzas de son que poidan ocorrer no proceso.