1. 平级比较：常见结构有as 形容词/副词 as；not as/so 形容词/副词 as；as＋形容词＋a/an 单数名词 as。
【考例1】 翻译：经过多年的建设，这个小镇现在和地震前一样充满了活力。(as...as)
解析：
本题考查as 形容词 as结构。答案为After years of construction, this town is as lively now as it used to be before the earthquake.
【考例2】 Our neighbor has ______ ours.
A. as a big house as
B. as big a house as
C. the same big house as
D. a house the same big as
解析：B。
本题考查as＋形容词＋a/an 单数名词 as结构。
【考例3】 I have seldom seen my mother ______ pleased with my progress as she is now.
A. so
B. very
C. too
D. rather
解析：A。
本题考查not/never/seldom… as/so 形容词 as结构。
2. 比较级：比较级通常用形容词/副词的比较级形式 than表示。用于修饰比较级的常见词语有a lot, far, a bit, a little, much, slightly, any, no, some, even, still。此外，比较级前还可加表示数量的词，如a few, a couple, one-fourth, 10 per cent等。注意：very, too, quite, so, fairly一般不修饰比较级。
【考例1】 It may not be a great suggestion. But before ______ is put forward, we’ll make do with it.
A. a good one
B. a better one
C. the best one
D. a best one
解析：B。
“the 比较级 名词”表示两者中比较……的一个；“a 比较级 名词”表示一个更……的人/物。句意：这也许不是一个很好的建议，但在提出一个更好的建议之前，我们会将就的。根据句意可知用比较级。
【考例2】 I think watching TV every evening is a waste of time—there are ______ meaningful things to do.
A. less
B. more
C. the least
D. the most
解析：B。
“more 形容词”构成比较级。
【考例3】 You’d be exposed to a lot ______ pollution if you moved to a town with pure water and air.
A. more
B. most
C. less
D. least
解析：C。
less表示“更少的”。句意：如果你去一个有着碧水蓝天的小镇，那么你所受的污染会少一些。根据句意可知此处选C。
3. 最高级：通常用the 形容词/副词的最高级形式 (among/of/all)…。修饰最高级的常见词语有the very, the 序数词, by far等。
【考例1】 This is by far ______ movie that I have ever seen. \
A. an inspiring
B. a much inspiring
C. the most inspiring
D. the more inspiring
解析：C。
by far可用于修饰形容词或副词的比较级或最高级，再根据定语从句可推断出此处用最高级。
【考例2】 —How was your recent trip to Sichuan?
—I’ve never had ______ one before. (2011四川)
A. a pleasant
B. a more pleasant
C. a most pleasant
D. the most pleasant
解析：B。
“否定词 比较级”表示最高级含义。
倍数表达1. 倍数 as 形容词/副词的原级＋as…
2. 倍数＋形容词/副词的比较级＋than…
3. 倍数 the 名词(如size, height, weight, length, width 等)＋of…
4. 倍数 as 形容词 a/an 名词 as…
5. 倍数 as many (或 much )＋名词＋ as…
6. 倍数 what从句/ that of…
【考例1】 It’s said that the power plant is now ______ large as what it was.
A. twice as
B. as twice
C. twice much
D. much twice
解析：A。
本题考查“倍数 as 形容词/副词的原级＋as…”结构。
【考例2】 This restaurant wasn’t ______ that other restaurant we went to.
A. half as good as
B. as half good as
C. as good as half
D. good as half as
解析：A。
本题考查语序，正确的语序应该是“倍数 as 形容词/副词的原级＋as…”。
【考例3】 My uncle’s house in the downtown area is much smaller than ours，but it is twice ______ expensive.
A．as
B．so
C．too
D．very
解析：A。
本题考查倍数表达法。这里的倍数是twice，由expensive这一原级可知，这里使用了as...as...这一结构，expensive后面省略了as ours。
