有效的句子要有重點(diǎn)，并且要突出重點(diǎn)。句子的重點(diǎn)可以通過(guò)下列方法，加以突出：

1. 把重點(diǎn)擺在句首或句尾. 一般而論，最顯眼的位置是在“句尾，其次是在句首，中間的位置最平淡，乏善可陳。例如：

(1).Incorrect grammar and improper construction invariably distract readers‘ attention.

(2) The history of vocabulary is, in many ways, the record of civilization.

把重點(diǎn)放在句尾是種“吊胃口”的方法，讀者或聽(tīng)者非得讀完或聽(tīng)完整句不可。

2. 在復(fù)雜句里，把主句放在從句之后.除了名詞從句和形容詞從句之外，因?yàn)樗鼈兾恢幂^固定，副詞從句中有幾種的位置靈活，可以在主句之前出現(xiàn)，也可以跟在主句之后。通常我們就把這樣的副詞從句提前，重點(diǎn)則放在后頭的主句，如(3b)：

(3a) I came upon an old classmate when I went to town yesterday.
???
(3b) When I went to town yesterday, I came upon an old classmate.

副詞短語(yǔ)更是如此，如 (4b):

(4a) Steel is commonly used to make knives, razors and other useful tools because of its durability.

(4b) Because of its durability, steel is commonly used to make knives, razors and other useful tools.

3. 把較重要或有分量的詞語(yǔ)放在后頭，如(5b)和(6b)：

(5a) I was delighted and amused by the classical opera

(5b) I was amused and delighted by the classical opera.

(6a) That singer‘s life was tragic and brief.

(6b) That singer‘s life was brief and tragic.