请帮帮忙，倒装句句型的用法，怎么构造倒装句

英语句子最基本的结构是主、谓结构,倒装就是将这种比较固定的词序加以颠倒.英语的倒装有两种形式.一种是将句子的主语和谓语完全颠倒过来,称为完全倒装,如:Then began an eight-year war between Iran and Iraq. (于是伊朗和伊拉克之间开始了长达八年的战争.).另一种是只将助动词(包括情态助动词)移到主语之前,称为部分倒装,如: Seldom can she finish her task in a short time. (她很难在短时间内完成任务.)

引起倒装的情况有很多,在大学英语四级考试中常见的主要有以下几种.下面举例说明.

一、虚拟条件句中的倒装
例1:________for my illness, I would have lent him a helping hand. (CET-4, 1995/1)
A) Not being B) Had it not been

C) Without being D) Not having been
本题答案为B).本句意思是:要是我没有生病,我肯定会给他帮助的.从主句的谓语可以看出,本题是过去时的虚拟语气,从句谓语应该用过去完成时.由于省略了连词if ,所以将 had 移到句首构成倒装结构.
例2:________before we depart the day after tomorrow, we should have a wonderful dinner party. (CET-4, 1997/1)
A) Had they arrived
B) Would they arrive
C) Were they arriving
D) Were they to arrive
本题答案为D).本句是将来时的虚拟语气,这点从从句的时间状语the day after tomorrow 可以看出.因此从句的谓语应用should或were to 动词原形.由于从句省略了连词if,就应将should或were移到句首,形成倒装.

二、表示否定意义的词或词组位于句首
例1