What's your favourite animal?为什么不加s?

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What''syourfavouriteanimal?为什么不加s?What''syourfavouriteanimal?为什么不加s?What''syourfavouriteanimal?为什么不加s?w

What's your favourite animal?为什么不加s?
What's your favourite animal?为什么不加s?

What's your favourite animal?为什么不加s?
what's = what is
is 是单数,所有 animal 也应该是单数