普通专升本英语语法：倒装结构之部分倒装

    部分倒装
    部分倒装指将谓语的一部分如助动词或情态动词倒装至主语之前,而谓语动词无变化。如果句中的谓语没有助动词或情态动词，则需添加助动词do, does或did，并将其置于主语之前。
    1. 下列否定词及含有否定意义的词组修饰状语时，若置句首，句子的主谓要部分倒装 ：never, no, neither, not only, hardly, scarcely, little, seldom, rarely, not until, nowhere, at no time, on no account, in no respect, in no sense, by no means, in no way, no longer, no less, no more, no sooner than, under no circumstances, in vain, still less。
    例如：Not only is its direct attack on their discipline, it bypasses the essence of what sociologists focus on. Under no circumstances should we do anything that will benefit ourselves but harm the interests of the state.
倒装结构之部分倒装
    2. 以only修饰状语开头的句子，句子的主谓要部分倒装
    例如：Only when you have obtained sufficient data can you come to a sound conclusion.
    3. 以下列副词或短语开头的句子，句子的主谓要部分倒装 ：often, so, well, to such a degree, to such an extent, to such extremes, to such a point，many a time。
    例如：So involved with their computers do the children become that leaders at summer computer camps often have to force them to break for sports and games.