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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rū, rú, rǔ, rù

second tune

rú

as; like; similar to such as; according to 如 rú

if; what if 如果 rú guǒ
as; like 如 rú	outcomes 果 guǒ

scholar; learned person Confucianism; Confucianist 儒 rú

gentle and refined learned and refined scholarly and cultured 儒雅 rú yǎ
scholar 儒 rú	refined; graceful 雅 yǎ

Chinese characters also pronunced rú

third tune

rǔ

milk; breast 乳 rǔ

breast milk 母乳 mǔ rǔ
mother 母 mǔ	milk 乳 rǔ

Chinese characters also pronunced rǔ

fourth tune

rù

enter; into 入 rù

ENTRANCE 入口 rù kǒu
enter 入 rù	opening 口 kǒu

insult; disgrace; humiliate 辱 rù

Chinese characters also pronunced rù