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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bū, bú, bǔ, bù

second tune

bú

not; negative 不 bú

don't don't want 不要 bú yào
not 不 bú	want; must 要 yào

third tune

bǔ

arrest; catch 捕 bǔ

catch; capture 捕捉 bǔ zhuō
arrest; catch 捕 bǔ	catch; seize 捉 zhuō

supply; make up for 補 bǔ

replenish; supplement 補充 bǔ chōng
supply 補 bǔ	fill 充 chōng

Chinese characters also pronunced bǔ

fourth tune

bù

no; not 不 bù

pace; step 步 bù

footstep; steps 腳步 jiǎo bù
leg; foot 腳 jiǎo	pace; step 步 bù

fabric; textile 布 bù

terror; horror 怖 bù

horror; terror dreadful; horrible 恐怖 kǒng bù
dread; fear 恐 kǒng	terror; horror 怖 bù

Chinese characters also pronunced bù