三、对等连词前后的一致
由and, or, but, than, both...and, either...or, rather than 等对等连接词连接起来的成分彼此间在形式上应力求保持一致。具体有以下几个方面
(一) 数的平行：对等连词接连起的名词在单复数形式上通常一致，and和both...and连接两个单数名词，谓语动词用复数形式，either...or连接两个单数名词，谓语动词用单数形式
- Dictionaries may be used to answer question ［A］ , to solve ［B］ problems, or to obtain ［C］ information ［D］ .
- Both the male and the female _____ working in the field.
［A］ be
［B］ are
［C］ is
［D］ bieng
(二)时态的平行： 在同一时间背景下，对等连词所连接的动词应采用一致的时态
- A line segment, which is part of a straight line, begins at one point _____ at another.
［A］ ending
［B］ by ending
［C］ the end is
［D］ and ends - Gravity not only causes bodies to fall _____ their speed.
［A］ and to increase
［C］ and increases
［B］ but also increase
［D］ but also increases - Nearly all trees have seeds that fall to the earth, take root, and eventually _____ .
［A］ generate new seeds
［B］ new seeds generated
［C］ by generating new seeds
［D］ new seeds generated there
另外，我们还要注意，两个分句之间的代词与名词、助动词与实义动词之间的代替，如：I rely on the system to fix itself, which it usually does with no help from me beyond crossing my fingers. 我以靠系统来修复系统本身，除了用几下手指之外，不需要我的其它帮助，系统经常这样修复自己。
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(三)对等连词所连接的各成分应在词性和形式上的呼应
- The purpose of the research had a more important meaning for them than _____ .
［A］ ours
［B］ with us
［C］ for ours it had
［D］ it did for us - Methods of flood control focus on preventing rivers from rising and _____ .
［A］ keep them within their banks
［B］ to keep them within their banks
［C］ keeping them within their banks
［D］ being kept them within their banks - Both dogs and cats have ［A］ a keen ［B］ sense ［C］ of smell, sight, and tasting ［D］ .
(四)排列位置的平行，对等连词前后成分的位置应呼应
- A widespread species, roundworms even thrive on the peaks of mountains and _____ .
［A］ at the bottoms of the oceans
［B］ there are the bottoms of the oceans
［C］ the bottoms of the oceans do
［D］ which the bottoms of the oceans - My cousin composes not only ［A］ the music, but ［B］ also sings the songs for ［C］ major ［D］ Broadway musicals.