比如下面的句子，让步状语从句倒装后位于句首的名词没用冠词（这个我明白）：

Expert as he was, he failed. 他虽是专家，但还是失败了。

King as he was, he was unhappy. 他虽是国王，但他并不幸福。

Child as he is, he knows to help other. 他虽然是个孩子，但知道帮助别人。

Teacher as Michael is, he is not capable of teaching all subjects. 迈克虽是老师，但他也不能教所有的科目。

我的疑问：如果名词前有形容词修饰呢？那么名词前用不用冠词？如：

Excellent expert as he was, he failed.

Great king as he was, he was unhappy.

Small child as he is, he knows to help others.

Experienced teacher as Michael is, he is not capable of teaching all subjects.

还是？

An excellent expert as he was, he failed.

A great king as he was, he was unhappy.

A small child as he is, he knows to help others.

An experienced teacher as Michael is, he is not capable of teaching all subjects.

请专家老师分析和指导！