1.罗列法(listing)
在文章开始时提出需要说明的东西和观点，然后常用first，second，and finally加以罗列说明。罗列法广泛地使用于各类指导性的说明文之中，下面这篇学生作文就是用罗列法写成的：
early rising
early rising (早起) is helpful in more than one way. first， it helps to keep us fit (健康)。 we all need fresh air. but air is never so fresh as early in the morning. besides， we can do good to our health from doing morning exercise (做早操)。
secondly， early rising helps us in our studies. we learn more quickly in the morning， and find it easier to remember what we learn in the morning.
thirdly， early rising enables (使能够) us to plan the work of the day. we cannot work well without a good plan. just as the plan for the year should be made in the spring， so the plan for the day should be made in the morning.
fourthly， early rising gives us enough time to get ready for our work， such as to wash our faces and hands and eat our breakfast properly.
late risers may find it very difficult to form the habit of early rising. they ought to make special efforts to do so. as the english proverb says，early to bed and early to rise， makes a man healthy， wealthy and wise.
罗列法经常用下列句式展开段落，我们可以注意模仿学习：
there are several good reasons why we should learn a foreign language. first of all， secondly， and finally，
we should try our best to plant more trees for several good reasons first of all， secondly， and finally，
必须指出的是，有时罗列法并不一定有明确的first， second等词，但文章还是以罗列论据展开的。
2.举例法(examples)
举例法是用具体的例子来说明我们要表达的意思，常用for example， for instance， still another example is等词语引出。下面这篇学生作文就是用举例法写成的：
recreation
it is impossible to keep in good health unless we take enough recreation (娱乐)。 the mind， too， needs change to make it fresh and vigorous (有活力的) there is much truth in the old saying， all work and no play makes jack a dull boy.
there are many games which boys and girls can play after their school work is done， for instance， football， tennis， and kite-flying. other examples of recreation are boating， fishing， gardening， cycling， walking， chess-playing， and reading. persons who sit much at their business should take a kind of recreation that will supply their muscles (肌肉) with exercise. those who spend most of their time in the open air and do manual work (体力活) should adopt (采纳) reading or some other quiet form of recreation.
cycling is said to be an important means of recreation， but many persons foolishly tire out themselves by cycling too much. the same may be said in regard to football. tennis is a pleasant form of recreation. many persons take great delight in boating. fishing requires much patience， and there is much danger of taking cold by sitting still on a cold day too long. a good brisk (轻松) walk is one of the finest forms of exercise. for persons engaged in outdoor labor， chess-playing is another excellent form of recreation.
可以看出，举例法和罗列法有时可以结合使用：即用罗列法来列出例子，用例子充实罗列的说明。
3.比较法(comparison and contrast)
比较法是对两个对象进行比较，从而进行说明的写作手法。比较法又可细分为比较相同点(comparison)和比较不同点(contrast)两种方法，比如：
from paragraph to essay
although they are different in length (长度)， the paragraph and the essay are quite similar in structure (结构)。 for example， the paragraph starts with either a topic sentence (主题句) or a topic introducer followed by a topic sentence. in the essay， the first paragraph sets up the topic focus (主题所在) next， the sentences in the body of a paragraph develop the topic sentence. similarly， the body of an essay consists of a number of paragraphs that discuss and support the ideas given in the introductory (引导的) paragraph. finally， a concluding sentence (结束句) whether a restatement， conclusion， or observationends the paragraph. the essay， too， has a concluding paragraph which ends the essay logically and satisfactorily. although there are some exceptions (例外)， most well written expository (说明文的) paragraphs and essays are similar in structure.
可以看出，在比较相同点的时候，常用到similarly，also，too，in the same case，in spite of the difference等这样的词语。
european football and american football
although european football is the parent of american football， the two games show several major differences. european football， sometimes called association football or soccer， is played in 80 countries， making it the most widely played sport in the world. american football， on the other hand， is popular only in north america (the united states and canada)。 soccer is played by eleven players with a round ball. football， also played by eleven players in somewhat different positions (位置) on the field， is played with an elongated (拉长的) round ball. soccer has little body contact (接触) between players and therefore needs no special protective equipment. football， in which players make the greatest use of body contact to stop a running ball-carrier and his teammates， needs special protective equipment. in soccer， the ball is advanced toward the goal by kicking it or by butting (顶) it with the head. in american football， on the other hand， the ball is passed from hand to hand or carried in the hands across the opponents (对手) goal. these are just a few of the features which distinguish (区别) association and american football.
这是一篇用比较不同点的手法写的说明文。从文章中可以看出：however，on the other hand，in contrast，but，nevertheless等表示转折的词语常用来引导对不同点的比较。
4.定义法(definition)
定义法也是英语说明文中常用的写作手法，特别是在对具体事物概念进行说明时经常使用。定义法的基本要素是定义句。英语中常见定义句的模式是：
被定义对象is所属类别+限制性定语
可以看出，定义句中限制性定语越详细，定义就越精确，比如：
a bat is a small mouse-like animal that flies at night and feeds on(以为食品)fruit and insects but is not a bird.
其实，在英英词典中，对英语单词的英文解释就是定义法的典型例子。比如，看看longman词典对student和teacher的定义是很有意思的：a student is a person who is studying at a place of education or training. a teacher is a person who gives knowledge or skill to sb. as a profession (专业)。
5.顺序法(sequence of time， space and process)
顺序法是指按时间、空间或过程的顺序进行说明的一种写作手法。比如按照时间顺序介绍一个科学家的生平，用空间顺序阐述逐渐开发西部的重要意义，用过程顺序法解释葡萄酒的生产过程等等。
coal
coal underwent (经受) many changes before it became the bright， brittle (脆的)， black substance which we now use. during ancient times (在上古时代)， when the earth enjoyed a very warm and wet climate， the land was covered with large forests and big plants. as time went on， the ground changed and began to sink (下沉) a little. these very large numbers of trees and vegetables received a deposit (沉淀) of sand and clay. this layer of sand and clay pressed upon the layer beneath and prevented it from contact with air. these trees and plants received the pres sure and changed its appearance.
generations after generations (几世纪后)， as the ground kept gradually sinking， another layer of sand and clay was again deposited (积聚) above the layers already formed. a great pressure was thus exerted (作用) and the peat (泥煤) was changed into the black and brittle substance which is known as coal.
coal is a kind of mineral which is formed by nature as above stated. it is an important industrial material and is chiefly used as fuel. it is very valuable in the industrial world. the place where coal deposit is called a coal mine (煤矿)。 in china， coal mines are largely found in the north-west part of the country. shanxi is a famous province for producing coal. it has the most coal of china.
6.分类法(classification)
分类法是将写作对象进行分类说明的一种写作手法。比如：著名的英国
哲学
家弗朗西斯培根(francis bacon)在其脍炙人口的《谈读书》(of studies)一文中就用到了分类法：some books are to be tasted， others to be swallowed， and some few to be chewed and digested， that is， some books are to be read only in parts， others to be read， but not curiously， and some few to be read wholly， and with diligence and attention. some books also may be read by deputy， and extracts made of them by others; but that would be only in the less important arguments， and the meaner sort of books
