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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bēi, béi, běi, bèi

first tune

bēi

sad; sorrow 悲 bēi

mercy 慈悲 cí bēi
kind; loving 慈 cí	sad; sorrow 悲 bēi

cup, mug 杯 bēi

teacup 茶杯 chá bēi
tea 茶 chá	cup 杯 bēi

Chinese characters also pronunced bēi

third tune

běi

north 北 běi

North Pole 北極 běi jí
north 北 běi	utmost 極 jí

fourth tune

bèi

multiple 倍 bèi

double 加倍 jiā bèi
add 加 jiā	multiple 倍 bèi

prepare 備 bèi

prepare 準備 zhǔn bèi
exact; accurate 準 zhǔn	prepare 備 bèi

back of the body 背 bèi

behind, at the back 背後 bèi hòu
back 背 bèi	after; behind 後 hòu

shellfish 貝 bèi

treasure, precious 寶貝 bǎo bèi
treasure 寶 bǎo	shellfish 貝 bèi

generation 輩 bèi

senior master 前輩 qián bèi
preceding 前 qián	generation 輩 bèi

Chinese characters also pronunced bèi