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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to link more related multi-character Chinese words!

duī, duí, duǐ, duì

first tune

duī

pile 堆 duī

compost 堆肥 duī féi
pile 堆 duī	fertilizer 肥 féi

loads of; a lot of something 一大堆 yí dà duī
one 一 yí	big 大 dà	pile 堆 duī

fourth tune

duì

correct pair 對 duì

right or wrong 對,錯 duì cuò
right; correct 對 duì	wrong 錯 cuò

mate; make a pair 配對 pèi duì
to match, pair 配 pèi	pair 對 duì

team 隊 duì

team leader captain of a team 隊長 duì zhǎng
team 隊 duì	chief 長 zhǎng

troops; armed forces 部隊 bù duì
military unit 部 bù	team 隊 duì

Chinese characters also pronunced duì