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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kuō, kuó, kuǒ, kuò

fourth tune

kuò

broad; wide rich; wealthy 闊 kuò

broad; wide; spacious 寬闊 kuān kuò
wide 寬 kuān	broad; wide 闊 kuò

lavish; showily rich opulent; extravagant 闊氣 kuò qì
rich; wealthy 闊 kuò	air 氣 qì

expand; enlarge 擴 kuò

enlarge; expand broaden the scope 擴大 kuò dà
expand; enlarge 擴 kuò	big; large 大 dà

Chinese characters also pronunced kuò