The following video demonstrates each syllable of the pinyin structure
and the exercise of pinyin/zhuyin with basic Chinese 4-tune pronunciation

Mandarin pinyin tunes
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mō, mó, mǒ, mò

first tune

mō

feel by touch touch by fingers 摸 mō

second tune

mó

grind; sharpen 磨 mó

devil; demon 魔 mó

mold; standard 模 mó

Chinese characters also pronunced mó

third tune

mǒ

plaster; smear 抹 mǒ

fourth tune

mò

last; final; end 末 mò

doomsday; miserable end apocalypse; end of the world 末日 mò rì
last; end 末 mò	day 日 rì

do not never; none 莫 mò

ink; black 墨 mò

silent; quiet; speechless 默 mò

Chinese characters also pronunced mò