关于英语语法“主谓一致”的问题。

Question

百度百科“主谓一致”词条中，有以下段落：

在代词what, which, who, none, some, any, more, most, all等词的单复数由其指代的词的单复数决定.
All is right. (一切顺利.)
All are present. (所有人都到齐了.)
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为什么上面一个句子的谓语动词用单数，而下面一个用复数？

Answer 1

All is right,就像all is well,是指代的一个整体的事物，就像everything一样，是泛指，所以谓语动词用单数。而all are present,是指代的所有人，人“people”是可数的，所以这里谓语动词用复数。present在这里是一个形容词，意为“出席的，在场的”