独立的副词置于句首，整个句式完全倒装，即谓语完全置于主语之前。相应的副词有1、表地点：here、there；2、表时间：now、then；3、表方位：in、out、up、down、on、over、away；4、表程度或频率：often、long、not once、many a time；5、拟声词bang等等。
A. is there; I couldn't work B. there is; couldn't work
C. was there; I couldn't work D. there was; couldn't I work
Key：C
公式四：“否定意义词+助/系/情态动词+主+实意动词”
常见的否定意义词或短语有：not、never、seldom、rarely、by no means、in no time、at no time、under no circumstance、hardly … when、scarcely … when、no sooner … than、not only … (but also)、not until等等，否定意义词置于句首，整个句式部分倒装。
【典型例题】
Not until the early year of the 19th century _____ what heat is.
A. man did know B. man knew
C. didn’t know D. did man know
【问题解析】
Not until位于句首时，主句要部分倒装，而 know是实意动词不能直接提前，所以需借助助动词did，依据公式可知，正确答案为D项，意为“直到19世纪早期，人们才知道什么是热能。”
It is not until the early years of the 19th century _____ what heat is.
A. when man knew B. when did man know
C. that man knew D. that did man know
学生误解：
首先，句中包含强调句型It is … that，其最大特点为将其划掉不影响句意，学生划掉句中的It is … that；其次，not until这一否定意义词置于句首，整个句式部分倒装，由部分倒装的公式可得：did man know；最后，既包含强调句型It is … that，又同时包含部分倒装结构的选项为D项，即该题目的正确答案为D项。
教师点拨：
学生能够看出强调句型It is … that，可以排除A、B两项，强调的内容为not until引导的时间状语从句，而学生第二步中分析的部分倒装结构也强调了同样的内容，这恰是英语中所忌讳的重复表达，故这两个强调用法不能交叉使用，正确答案为C项。
句意为“如果天能够下雪的话，庄稼会长势喜人。”，显然这是对将来某情形的虚拟，从句中可以使用公式“If+过去时/ should do / were to do”，主句中使用公式“would do”；又因省略引导词If，可以提前的词有should、were或had，取两个条件的交集，可得出正确答案D项，可还原为If it should snow, the crops would grow better.
【特别关注】
Were it not for…“如果要不是…”，Had it not been for…“如果当时要不是…”，两个句式几乎成了固定句式。例如：Were it not for your help, I would never be a good boss.要不是你的帮助，我永远成不了好老板。Had it not been for you, I would have lost my way.当时要不是你，我就迷路了。
公式七：“分词 / 形容词+谓语+主语”
分词（现在分词与过去分词）与形容词置于句首，整个句式完全倒装，起到平衡句子成分的作用。
【典型例题】
1、Distinguished guests and friends, welcome to our school. the ceremony of the 50th Anniversary this morning are our alumni（校友）from home and abroad.
A. Attend B. To attend C. Attending D. Having attended
2、 at the meeting were mostly old workers between the age of 50 and 60 last week.
A. To present B. To presenting C. Present D. Presented
【问题解析】
1、当看不清倒装句式时，可将其还原为自然语序“Distinguished guests and friends, welcome to our school. Our alumni（校友）from home and abroad are the ceremony of the 50th Anniversary this morning.”，显而易见，考查attend的现在进行时用法，即正确答案为C项，意为“尊敬的来宾、朋友们，欢迎来到我校，今天来自国内外的校友们云集我校，出席50周年校庆”。
A. Child as he is B. Though child he is C. As he is a child D. Being a child as he
【问题解析】
该题考查的是以as, though引导的让步状语从句中，一般将表语提前进行强调。若表语是形容词可直接提前；若表语是名词，则需要去掉名词前的定冠词a, an, the。由此可排除B,C,D项，故正确答案为A项，意为“尽管他还是个孩子，却已能做大人做的事情”。
【特别关注】
1、由as, though“尽管”引导的让步状语从句中，若主语是名词，表语放在句首时，主语可以倒装，也可以不倒装；主语是代词时，不倒装。例如：Terrible as was the storm/the storm was, we continued our way. 尽管暴风雪很大，我们还是继续赶路。