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!

fōu, fóu, fǒu, fòu

third tune

fǒu

negate; negative answer 否 fǒu

deny; refuses to admit 否認 fǒu rèn
negate; negative 否 fǒu	admit 認 rèn

yes or no whether or not 是否 shì fǒu
yes 是 shì	negative 否 fǒu