有一读者问： 有这样一道辨错题：
(1)Limitless (A: is as the energy of the sun), we (B: have not found) an (C: effective) way to make use of it (D: in industry).
A显然错了。答案是将之改为as is the energy of the sun，而我则认为应改为as the energy of the sun is, 不知对否？
我们知道，主语部分如较长，为了避免头重脚轻，英语常用倒装结构，将主语部分置于动词或助动词等之后，如：
(2)They erect a bronze tablet on which is carved “The Yellow River Source”. （主语The Yellow River Source置于is carved之后）
(3)Facing the rostrum are the huge portraits of Marx, Engels, Lenin and Stalin. （主语the huge portraits...置于are之后）
你所引的句（1）中的主语部分the energy of the sun显然也比较长，所以答案没有错，应将它置于as is之后。这种“as+助动词或be或have+主语”倒装结构在英语里并不罕见，再如：
(4)The present owner is a keen at collector, as were several of her ancestors.
(5)She did not sway from side to side as do some people who lose themselves in the intoxication of music.
与“as+倒装结构”相类似的还有“than+倒装结构”，如：
(6)No more than can a woman forget her suckling child can he forget the tribulations of the people.
