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谓语动词放在主语之前的这种语法现象称为倒装。倒装句可分为全部倒装（full inversion）和部分倒装（partial inversion）两种。前者是指整个谓语置于主语之前，而后者仅是指助动词、情态动词或be 动词等功能置于主语这前。 引起倒装的情况多种多样，倒装的表现形式大体有下列几种： 1．在there be 及其类似结构中 例1：There are forty students in our class. 例2：There seem to be still some elements undiscovered yet. 例3：There stands a bridge across the river. 2．在表示祝愿的句子中 例1：Long live the Peoples Republic of China! 例2：May you succeed! 例3：Dog-tired though they were, they continued to march on. 3．在疑问句中 例1：How are you getting along with your work? 例2：Is this report written in detail? 注：如疑问词作主语或者作定语修饰主语时，不发生倒装。 4．在省略if 的虚拟语气条件状语从句中 这类句子中有were, had, should等词时，把were, had或should置于句首。 例1：Were there no air or water, there would be no life in the world. 例2：Had you been more careful, such spelling mistakes might have been avoided. | 
