中間只能用形容詞或副詞的原級，不能用比較級或最高級。如果在第二個as之後使用獨立的人稱代詞，壹般說來用主格(較正式)或賓格(非正式)均可。如：
He’s as old as she [her]. 他年紀跟她壹樣大。
但是，若第二個as之後的人稱代詞跟有謂語動詞，則該人稱代詞只能用主格。如：
He is as old as she is.
在肯定句中用as…as, 在否定句中用not as…as或not so…as 均可。如：
He doesn’t study as [so] hard as his brother. 他學習不如他弟弟努力。
如果涉及數量或程度可用：as much+ (不可數名詞+) as / as many+ (可數名詞復數+) as。如：
You must speak English as much as possible. 妳必須盡可能地多說英語。
You’ve made as many mistakes as I have. 妳犯的錯誤和我犯的壹樣多。
其間接形容詞時，有時該形容詞還可修飾另壹名詞，但這個名詞應帶有不定冠詞(註意詞序)。如：
I have as good a voice as you. 我的聲音和妳壹樣好。
修飾as…as結構的常見詞語有nearly, almost, just, exactly, half, quite, twice, three times等，請註意這些修飾語都只能放在as…as 結構之前 (而不能置於其中或其後。如：
I earn half as much as you do. 我只賺妳的壹半錢。
This rope is twice as long as that one. 這根繩子比那根長壹倍。
as…as結構在壹定的上下文中可以用其省略結構(即省去其中的壹個 as)。如：
She’s clever, but her brother is just as clever. 她很聰明，但她兄弟也壹樣聰明。
The woman married a man poor as herself. 這個女人嫁給了壹個與她壹樣窮的男人。
該結構根據情況可用使用以下修飾語：(not) nearly, almost, just, nothing like, exactly, not quite, half, one-ten, twice, three times, 30 per cent等，並且這些修飾語必須置於第壹個as之前，而不能置於其後。如：
He doesn’t play half as well as his sister. 他演奏的水平不及他姐姐的壹半。
This dress is twice as expensive as that. 這件連衣裙比那件貴壹倍。
as…as結構的翻譯技巧：
1. 當語境背景談的是兩個不同的人或事物在某壹個方面進行物比較時，as…as…結構可譯為“像……壹樣”。如：
You can get there just as cheaply by air as by train. 妳坐飛機到那裏同坐火車壹樣便宜。
2. 當語境背景談的是同壹個人或事物在某兩個不同的方面進行物比較時，as…as…結構的用法與both…and…相似，通常可譯為“既……又……”。如：
He was as sensitive as he was obstinate. 他既敏感又固執。
3. 用於as…as possible 與 as…as one can結構時，通常可譯為“盡量”“盡可能”“拼命地”。如：
Dictionaries should be as user-friendly as possible. 詞典應盡可能便於使用。
4. 用於as…as can [could] be結構時，通常可譯為“極其”“非常”“要多……就多……”。如：
Both houses were as clean as could be. 兩座房子都極其幹凈。
5. 當該結構後接數量表示程度時，相用法大致相當於up to，通常可譯為“達到”。如：
She can run as fast as 20 miles an hour. 她每小時能跑20英裏。