(1) 基本型：as + 原级(形容词/副词)+ as... (和...一样)
eg1: kim is as tall as his brother (is).
eg 2: She can danceaswellasAnna (can).
(2) not as/so + 原型(形容词/副词) + as... (比...不如...)
eg1: I don't run as fast as my brother (does).
= I don't run so fast as my sister (does).
(3) as + 形容词 + 名词+ as... (和...一样)
eg1:he has as many shoes as i (do ).
(需注意的是：這裡的形容词(many) 和名词(books)不可以分开，因为形容词是用来修饰名词的，所以若写成：he has shoes as manyas she.是错误的)
eg 2:People living in Hong Kong currently use twice as many resources as residents in China.
(4) 倍数+ as ... as (...是...的几倍)
eg1:This dog is twiceas large as that one.
eg 2:That dog is half as large as this one.
Eg3: This book is one-thirdaslongasthat one.
(補充：二分之一為half，四分之一為 a/one quarter)
肯定：A + be + as形as + B(A和B一樣地…)
否定：A + be + not so (as)形as + B(A不如B一樣地…)
She isas old asI (am).
She isnot so/as beautiful ashermother.
as well as不僅=not only…but also…，和=and
A + be + less形than +B(A不像B那麼地…)
A+ be + least形of the three (of all)(A是…中最不…的)
Tomisless cleverthan his brother.
=Tom isnot so cleveras his brother.
Thisisthe least expensivebook of all.
=This book isless expensive thanany other (all the other)book(s).
=No other book(s) are(is) more expensive than this book.
be senior to = be older than
be junior to = younger than
be major to = be more than
be minor to = be fewer than
be superior to = be higher than
be inferior to = be lower than