英语中as表示即使是不是必须倒装

纠正你的不规范的说法或用法：
当as - = although-/ though-，引导让步状语从句时，从句的语序是，表语或宾语部分必须提到句首：这叫“前置”，不是倒装。
倒装：指 “谓语动词或谓语部分的助动词提到了主语的前面，即正常的 主语在前，谓语在后的语序出现了（部分）颠倒。
而前置是，提前/前置部分+ 主语+ 谓语，即主、谓部分没有颠倒，依然 "主语在前，谓语在后”。
如：虽然他是个孩子，但他已闻名世界了。
Although he is a child, he's well known all over the world.
= Though he is a child, he's...
= Child though he is, he's.... ( Note: in this case, "a " must be left out here when fronting happens.)
= Child as he is, he's.... (Note: The same is true of "as-", that is, " a" must be left out, too.)
We can't say: A child though/as he is, he's....
We can't say, either: Child is though/ as he, he's....
Nor can we say: Child though/as is he, he's....

放句中的情况不要，与though用法一样。但如果是下列情况要，就是
smart as he is,he fail the exam即使他如此聪明，他还是在考试中失败了
如果放举手，就要这样倒装