Good student as he is, …

结构︰

名词＋as＋主语＋be 动词，…

说明︰

此句型意为“虽然…，但是…”。等于“though＋<主语>＋be <动词>＋<名词>”。若 be <动词>之后的<名词>是单数，移至句首后<冠词>要省略。

Good students as they were (=Though they were good students), they sometimes erred.
虽然他们是好学生，偶而也会犯错。
Good student as he is (=Though he is a good student), he sometimes makes mistakes.
虽然他是好学生，偶而也会犯错。
Coward as he is (=Though he is a coward), he can’t bear such an insult.
虽然他是懦夫，却无法忍受这样的侮辱。