不了解为何发布不了，只能发图片试一试。
第二句多了一个 but ,全句可以是：
No one but her knows Russian.（ No one 是主语 )
No one but her herself knows Russian.
No one but she herself knows Russian.
No one but she knows Russian.
第三句也可以单独用人称代词：
It looks as if no one except him can be there early.
【说明】以下内容引自《牛津英语使用方法指南》第四版：
在 but 后面，一般用宾格代词（me, him 等）。在较正式的文体中，主格代词（I, he 等）可以用在动词前面。
Nobody but her would do a thing like that. 除去她，没人会干出那种事情。（较正式的说法：Nobody but she...）
