题目内容：

1.作表语的现在分词,过去分词,形容词放在句首,必须完全倒装.有请专家解释这条语法规则对吗?

优质解答

刚才你问时没看仔细,你说的语法现象是存在的.
通常是这样说的：在谓语是Be,表语提前的句子里,句子需完全倒装：
如：
1,so busy is the doctor that he has no time to spare.
2,happy is he who devotes himself to the cause of communism.