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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gōu, góu, gǒu, gòu

first tune

gōu

entice; seduce 勾 gōu

seduce; entice 勾引 gōu yǐn
entice; seduce 勾 gōu	attract 引 yǐn

hook 鉤 gōu

fishhook 魚鉤 yú gōu
fish 魚 yú	hook 鉤 gōu

Chinese characters also pronunced gōu

third tune

gǒu

dog 狗 gǒu

loyal dog 忠狗 zhōng gǒu
loyal; faithful 忠 zhōng	dog 狗 gǒu

Chinese characters also pronunced gǒu

fourth tune

gòu

enough 夠 gòu

not enough; insufficient 不夠 bú gòu
not 不 bú	enough 夠 gòu

buy; purchase 購 gòu

shopping 購物 gòu wù
buy; purchase 購 gòu	things 物 wù

construct 構 gòu

structure 結構 jié gòu
tie; form 結 jié	construct 構 gòu

Chinese characters also pronunced gòu