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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tōu, tóu, tǒu, tòu

first tune

tōu

steal 偷 tōu

second tune

tóu

toss; throw 投 tóu

head 頭 tóu

fourth tune

tòu

penetrate; pass through 透 tòu

transparent 透明 tòu míng
penetrate 透 tòu	clear 明 míng