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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suō, suó, suǒ, suò

first tune

suō

shrink; contract draw back 縮 suō

Chinese characters also pronunced suō

third tune

suǒ

lock; lock up 鎖 suǒ

so; that which place; location; position 所 suǒ

therefore; so 所以 suǒ yǐ
so 所 suǒ	according to 以 yǐ

toilet; lavatory; restroom 廁所 cè suǒ
lavatory 廁 cè	place 所 suǒ

Chinese characters also pronunced suǒ