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!

duān, duán, duǎn, duàn

first tune

duān

upright 端 duān

upright and proper 端正 duān zhèng
upright 端 duān	upright; right 正 zhèng

Dragon Boat Festival 端午節 duān wǔ jié
upright 端 duān	noon 午 wǔ	festival 節 jié

third tune

duǎn

short in length 短 duǎn

short trousers 短褲 duǎn kù
short 短 duǎn	pants; trousers 褲 kù

long and short 長,短 cháng duǎn
long 長 cháng	short 短 duǎn

fourth tune

duàn

section 段 duàn

stage of work 階段 jiē duàn
steps; stairs 階 jiē	section 段 duàn

break decide 斷 duàn

cut off 切斷 qiē duàn
cut 切 qiē	break 斷 duàn

judge right or wrong 判斷 pàn duàn
tell apart 判 pàn	decide 斷 duàn

Chinese characters also pronunced duàn