Xinfeng dialect's Ru tone does not change, though in Sidu dialect despite the tone sandhi , it only has one Ru tone.

The Middle Chinese Entering Tone is usually split regularly into other tones in the Northern dialects, but the Beijing Dialect forms an exception.

The evolution of tone IV in other dialects can also be explained in the same way.

Keep in mind the pronunciation of ancient characters with entering tone in putonghua.

The writer here thinks the entering tones really exist by analyzing what Zhou Deqing stated about the entering tones and some key words.