想將一件事情描述生動、具體，需要進行擴展。
有詞性角度的擴展：限定詞、形容詞副詞、介詞短語。
1、限定詞：限定作用，主要限定名次。常見的冠詞、數詞、名詞所有格等可以起限定作用。
例句：The roughly 20 million inhabitants of these nations looked hopefully to the future.
More than two dozen companies sell DNA tests directly to the public, ranging in price from a few hundred dollars to more than $2,500.
two dozen（兩打，二十四個，泛指的含義）
By the third generation,one third of Hispanic women are married to non-Hispanics,and 41 percent of Asian-Amreican women are married to non-Asians.
Mark Twain's Huckleberry Finn exemplified American anti-intellectualism.
Mark Twain's 名詞所有格。
2、形容詞副詞
形容詞副詞是最重要的修飾成分。
例句：The angry boy shouted angrily.
(1)修飾限定名詞（放在名詞兩邊的稱為定語；名詞+系動詞+形容詞，形容詞作系動詞表語，但仍然修飾名詞）
例句:The idea seems promising,and Rosenberg is a perceptive ovserver.
Their thinking often had a traditional superstitious quality.
(2)副詞修飾動詞、句子、其他的形容詞副詞（名詞歸形容詞管，其他歸副詞管）
... and the right mental workouts can significantly improve our basic cognitive functions.
Similarly, the physical act of laughter could improve mood.
The tourist streams are not entirely separate.
... because they are so closely tied.
3、形容詞、副詞的三種比較級別
比較只能針對形容詞、副詞。
（1）原級比較（我和你一樣即同級比較）
as + adj./adv.原型（比較的內容） + as + 比較的對象。
「和......相比一樣的......」（英語的比較詞序是反序）
例句:Few people are as fertile as in the past.
The goals of the prize-givers seem as scattered as the criticism.
（2）比較級（我和你相比更怎麼怎麼樣）
adj./adv.的比較級 + （than 比較的對象）
「（和......相比）更......
通常用於兩者之間的比較。
... younger,healthier people can realize their potertial.
Rich economies are also less dependent on oil than they were,and so less sensitive to swings in the oil price.
（3）最高級（表示最怎麼怎麼）
adj./adv.的最高級 + （介詞短語表示比較的範圍）
」（......範圍內）最......「
通常用於三者或以上的比較。
Some of the biggest developments will be in medicine.
The best lawyers made skyscrapers-full of money......
內容小結：
通過詞性的擴展可以將簡單句表達得更生動、更具體。
1、限定詞修飾限定名詞
2、形容詞、副詞作修飾成分
3、形容詞、副詞的三種比較級別：原級比較/比較級/最高級