星期二、如何寫說明原因段和說明方法段
一、段落基本句型構(gòu)造
1.說明原因段
說明原因段一般出現(xiàn)在圖表闡釋類和說明現(xiàn)象類作文的第二段，其基本句型構(gòu)造是：先用一句話引出下文對現(xiàn)象或問題原因的說明，這是段落的主題句；然后用3-5句話列舉2-3點(diǎn)具體的原因，以支持主題句。
例
Directions : For this part , you are allowed 30 minutes to write a essay entitled What Electives to Choose . You should write at least 120 words following the outline given below in Chinese :
1.各大學(xué)開設(shè)了各種各樣的選修課。
2.學(xué)生因?yàn)楦鞣N原因選擇了不同的選修課。
3.以你自己為例……
第二段：說明原因段
(1) There are many different factors deciding what electives the students choose . (2) Among all these factors , the interest of the students plays a very important role . (3) The students , of courses , would like to learn what he or she is interested in . (4) Moreover , many students will consider whether they could learn some practical skill by the elective , because nowadays companies are placing emphasis on a candidate's practical skills . (5) Besides , the ability and the prestige of the teacher is also an important factor influencing the student's choice .
2.說明方法段
說明方法段一般出現(xiàn)在方法對策類作文的第二段（偶爾也會出現(xiàn)在第三段，具體根據(jù)提綱），其基本的句型構(gòu)造是：先用一句話引出下文對解決辦法、應(yīng)對措施或決定因素的說明，這是段落的主題句；然后用3-4句話列舉2-3點(diǎn)具體的方法、措施或決定因素，以支持主題句；最后再用一句話對前面的方法做出總結(jié)（這句話有時可省略）
例
Directions : For this part , you are allowed 30 minutes to write a composition on the topic Reduce Waste on Campus . You should write at least 120 words following the outline given below in Chinese :
1.目前有些校園內(nèi)浪費(fèi)現(xiàn)象嚴(yán)重。
2.浪費(fèi)的危害。
3.從我做起，杜絕浪費(fèi)。
第三段：說明方法段
(1) Considering the seriousness of the problem , it is an urgent thing for us to take effective measures to eliminate waste on campus . (2) Firstly , we college students must stop wasting water , electricity and food in our daily life . (3) Secondly , we should learn to be economical and try to avoed spending money on something useless . (4) Thirdly , we have responsibility to call on all our schoolmates to fight against waste . (5) Only in this way can waste on campus be eliminated in the near future .
來源：原版英語網(wǎng)
