◇序數詞通常只修飾最高級。
Africa is the second largest continent.
The Yellow River is the second longest river in China.
This is the third most popular song of Michael Jackson.
◇為避免重複，我們通常用that, those, one, ones代替前面出現的名詞。that代替可數名詞單數和不可數名詞，those代替可數名詞複數。one既可指人又可指物，只能代替可數名詞。
The weather in China is different from that in America.
The book on the table is more interesting than that(或the one)on the desk.
?????? A box made of steel is stronger than one made of wood.
?????? 誤：In winter, the weather of Beijing is colder than it of Shanghai.
正：In winter, the weather of Beijing is colder than that of Shanghai.
◇「否定詞 + 比較級」相當於最高級。
----Wait until we get a satisfactory reply, will you?
----I couldn't agree more. The idea sounds great to me.
Nothing is so easy as this. =Nothing is easier than this. =This is the easiest thing.
◇比較級前一般不加冠詞。但表示兩者中較突出者，且比較級後又有名詞或出現了of the two，這時比較級前一定要加the。
He is the taller of the two.
Of the two jobs，he chose the harder.
Which is the younger one, Lily or Lucy?
試比較：
Which is larger, Canada or Australia?
Which is the larger country, Canada or Australia?
She is taller than her two sisters.
She is the taller of the two sisters.
◇不含than 的比較級前可加不定冠詞修飾，構成「a/an+比較級+單數可數名詞」表示 「一個更……的人/物」。
Why don’t you use a sharper knife? 你為什麼不用一把更鋒利的刀呢?
◇比較級than 後應用人稱代詞的主格，但非正式語體中常用賓格。
He is taller than I/me.
◇為避免重複，比較級中同樣的動詞用助動詞do, does, did替代。
I spend less time doing homework than John does.
She tells more funny jokes than we do.
以下內容不是初中教學的重點，僅供拓展之用。
◇形容詞most前面沒有the，不表示最高級的含義，只表示「非常」。
It is a most important problem. =It is a very important problem.
◇倍數表達法
▲A is three(four, etc.)times the size(height, length etc.)of B.
The new building is four times the size(the height)of the old one.
這座新樓是那座舊樓的四倍大(高)/這座新樓比那座舊樓大(高)三倍。
▲A is three(four, etc.)times as big(high, long, etc.)as B.
Asia is four times as large as Europe. 亞洲是歐洲的四倍大/亞洲比歐洲大三倍。
▲A is three (four, etc.)times bigger(higher, longer, etc.)than B.
Your school is three times bigger than ours.你們的學校比我們的學校大三倍。
用times表倍數通常用於三倍以上，兩倍可以用twice或double.