1． 比較對象是否明確

　　比較必須在同類事物之間進行，用that代替天氣和人口。如：

　　My pen is better than yours.

　　The weather of Harbin is colder than that of Beijing.

　　2．比較的范圍

　　比較級中的被比對象與比較對象必須屬于互不分離的兩個范圍。比較的對象如在同一范圍內。必須加other一詞，將比較的個體排除在外。范圍內加any other 范圍外加any.

　　He is taller than any other boy in his class.

　　Canada is larger than any country in Asia.

　　3． 比較級前的修飾語

　　常用來修飾比較級的詞有：much ,a little , a bit ,a lot ,even ,still ,a great deal of, far ,by far ,any ,rather

　　及表示倍數的詞。修飾可數名詞用：many more或few.修飾不可數名詞用：much more .

　　There are many more books in your library than in ours.

　　His handwriting is much better than mine.

　　4．比較狀語從句中的省略

　　than后是一個完整的句子，有時為了避免重復，把謂語部分省略。但如果前后時態不同，則不能省略。

　　The book is more interesting than that one (is interesting).

　　She is much taller than she was last year.

　　I think he will be more careful with his study than he is now.

　　5． 比較級與冠詞the的使用

　　表示“兩者中比較……的一個”，要用( the + 比較級 + of the two)的句式.

　　He is the stronger of the two boys.

　　English is the easier language of the two.

　　6．表示倍數的三個結構

　　1 )be + 倍數 + as …as

　　2 )be + 倍數 + 比較級 +than

　　3 )be + 倍數 + the +名詞(尺寸，長度)+of

　　The house is three times as big as that one .

　　The house is three times bigger than that one .

　　The pencil is twice the length of that one

　　7．比較級 + and + 比較級 → 越來越……

　　Days are getting longer and longer.

　　8．the + 比較級 ，the + 比較級 → 越……，越……

　　The more ,the better.

　　The more you eat, the fatter you’ll be.

　　9．the + 序數詞 + 最高級 + …

　　Which is the first most useful invention ?

　　10．one of + 最高級+ 名次復數

　　He is one of the tallest boys in his class.

　　11．由物主代詞修飾的時候，不用冠詞

　　He is my best friend.

　　特殊比較級的構成：

　　原形比較級最高級備注

　　farFarther / furtherFarthest / furthest

　　Many / muchmoremost

　　Good / wellbetterBest

　　oldOlder / elderOldest / eldest

　　littleLessLeast

　　Bad / badly / illWorseWorst

　　importantMore importantMost important多音節形容詞和副詞

　　Tired / slowly / loudly / clearly /careful / surprised / funnyMore ~ , most ~