托福寫作中一個(gè)段落的主題思想靠推展句來實(shí)現(xiàn)，如果只有主題句而沒有推展句來進(jìn)一步交待和充實(shí)，就不能構(gòu)成一個(gè)完整的段落。同樣，雖然有推展句，但主題思想沒有得到相對(duì)圓滿的交待，給讀者一種意猶未盡的感覺。這樣的段落也不能完成其交際功能。例如：

　　Physical work can be a useful form of therapy for a mind in turmoil. Work concentrates your thoughts on a concrete task. Besides, it is more useful to work you produce something rather than more anxiety or depression.

　　這個(gè)托福作文題目的段落的主題句是段首句。本段的兩個(gè)推展句均不能回答主題句中提出的問題。什么是 "a mind in turmoil"(心境不平靜)Physical work又如何能改變這種情況?為什么它能起therapy的作用?讀者得不到明確的答案。

　　要達(dá)到完整就必須盡可能地簡明。例如：

　　It is not always true that a good picture is worth a thousand words. Often writing is much clearer than a picture. It is sometimes difficult to figure out what a picture means, but a careful writer can almost always explain it.

　　段首句所表達(dá)的主題思想是一種看法，必須有具體事例加以驗(yàn)證。托福寫作經(jīng)驗(yàn)提到上述兩個(gè)推展句只是在文字上對(duì)主題作些解釋，整個(gè)段落內(nèi)容空洞，簡而不明。如果用一兩個(gè)具體的例子的話，就可以把主題解釋清楚了。比如下段：

　　It is not always true that a picture is worth a thousand words. Sometimes, pictures are pretty useless things. If you can't swim and fall in the river and start gulping water, will you be better off to hold up a picture of yourself drowning, or start screaming "Help"?

　　通過上面的托福寫作經(jīng)驗(yàn)可以看出要想讓分?jǐn)?shù)提高學(xué)會(huì)理清思路并簡化段落是很重要的，不同的托福作文題目有不同的套路，希望大家能早日攻克托福寫作。