具有否定意义的副词（never，not，neither，nor，hardly，little，seldom，scarcely，rarely，nowhere，not a bit ,not once,not a signle ,barely等）或含否定词的介词短语（at no time，by no means，in no case，in no way，on no condition，under/in no circumstance，on no account等）置于句首时，句子常用部分倒装。
Never before has she seen anybody who can play tennis as well as
no sooner...than,hardly/scarcely...when,not only..but(also)...,not until,neither ...nor...等句式中的部分倒装
在no sooner..than,hardly/scracely...when句式中，如果no sooner或hardly/scarcely放在句首，需将no sooner或hardly/scarcely放在句子部分倒装，且常用过去完成时，而其后than和when引导的句子不到装，且常用一般过去时。
No sooner had Igod home than it began to rain
not only ...but(also)...连接两个分句时，如果not only置于句首，需将not only 所在的句子部分倒装，but (also)引导的句子不到装。但如果not only...but also...仅连接连个并列词语，则不用倒装
Not only will help be given to peple to find jobs,but also medical treatment will be provided for people who need it
当not until...置于句首时，until从句的主谓不倒装，而主句需要部分倒装
Not until he left his home did he begin to know how important the family was for him
当neither...nor...连接两个分句，且位于句首时，前后两个句子都要倒装
Neither is he a good child nor is he a good student
only修饰介词短语，副词或状语从句，且置于句首时，（主句）用部分倒装
Only in this way can we learn English well
"so/neither/nor+be动词/助动词/情态动词+主语"表示前一句中的内容也适合于另一个或物，意为“...也（不）是如此”
He came last night,and so did I
在“so+adj/adv...that...”句型于“such+n.+that...”句型中，so/such连同它们所修饰的成分置于句首时，主句用部分倒装，that从句不倒装
So fast does light travel that we can hardly imagine its speed
在含有had/were/should的虚拟条件句中，可省略if，将had/were/should放在主语之前，构成部分倒装。
Had Mark invited me,I would have been glad to come
