`A`nswer: Rich though/as he is, he is unhappy.

Hoặc: However rich he is, he is unhappy.

`@` Mệnh đề nhượng bộ:

`-` Although/Though/Even though + S + V, S + V: mặc dù...nhưng...

`=` Adj + though/as + S, S + V + O

`=` However + adj/adv + S + V, S + V + O

$\color{pink}{\text{209w'Darwin}}$

Although he is rich, he is unhappy.

`->` Rich as he is, he is unhappy.

`->` However rich he is, he is unhappy.

`*` Mệnh đề nhượng bộ:

`=>` adj/adv + as/though + S + V, S + V + O  : mặc dù/ dù là...., thì

`=>` However + adj + S + V, S + V + O