復(fù)數(shù)代詞they, them, their 可以表示單數(shù)意義嗎

在通常情況下，復(fù)數(shù)代詞they, them, their 表示復(fù)數(shù)意義。如：

As is usual with children, they soon got tired. 孩子們一貫如此, 他們很快就厭倦了。

Although they are twins, they look entirely different. 他們雖是孿生，但是相貌卻完全不同。

If the trees had been given more attention, they could be grown better. 要是對(duì)這些樹(shù)多加注意，它們會(huì)長(zhǎng)得更好些。

When guests leave the host usually sees them out. 客人走時(shí)，主人通常送出門(mén)。

We invited 12, but only a handful of them came. 我們邀請(qǐng)12人，但只有幾個(gè)人來(lái)。

The Irish are very proud of their sense of humour. 愛(ài)爾蘭人為自己的幽默感而自豪。

Most of the families have modernized their kitchens. 大多數(shù)家庭已實(shí)現(xiàn)廚房設(shè)備現(xiàn)代化。

但是，在實(shí)際運(yùn)用中，有時(shí)也可以用復(fù)數(shù)代詞they, them, their來(lái)指代性別不明的單個(gè)人（即單數(shù)）。如：

Everyone knows what they have to do, don’t they? 每個(gè)人都知道自己必須做什么，對(duì)嗎？

If either David or Janet come, they will want a drink. 大衛(wèi)或珍妮特來(lái)的話，是會(huì)要喝酒的。

If any of them comes to see me, let them wait for me to come back. 如果他們中有人來(lái)看我，請(qǐng)叫他們等我回來(lái)。

When a person gets married, they have to start thinking about their responsibilities. 一個(gè)人結(jié)了婚，他們就得考慮考慮自己的責(zé)任。