单个单词可以做主语吗

Only those he knew well could be enrolled in the course.

He has made as much progress as is admirable.

单个only也可以做主语？

made和is都是谓语？

Only those he knew well could be enrolled in the course.

=Only those (who) he knew well could be enrolled in the course.

在这个句子中，Only 不是主语，those 才是主语。划线部分是定语从句，其余部分是主句。

He has made as much progress as is admirable.

as is admirable 是比较状语从句。has made 是主句的谓语动词，is 是比较状语从句的谓语动词。这里的 made 和 is 都不能单独作谓语。

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Only those (he knew well) could be enrolled in the course.

He has made as much progress as is admirable.

单个only 也可以做主语？

——Only 是一个强调 those 的副词，能做主语的话，those 干什么用呢？千万不要一叶障目，不见泰山。基本的语法常识，都哪里去了？

made和is都是谓语？

——has made 是谓语动词完成时态，不可独立存在，你怎么单独说一个过去分词？

is 是另外一个句子（比较从句）的谓语动词。