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
Click the framed calligraphic Chinese symbol icons
to link more related multi-character Chinese words!

kuāi, kuái, kuǎi, kuài

fourth tune

kuài

fast; quick rapid; prompt gratified 快 kuài

fast and slow 快,慢 kuài màn
fast 快 kuài	slow 慢 màn

happy; joyful; cheerful 快樂 kuài lè
gratified 快 kuài	joy; happy 樂 lè

chopsticks 筷 kuài

chopsticks 筷子 kuài zi
chopsticks 筷 kuài	suffix 子 zi

piece; a chunk 塊 kuài

Chinese characters also pronunced kuài