Explanation
Expressing that A is not as ~ as B; 'not as...as'
Formation
A は B ほど + い-Adjective stem (without い) + くない, な-Adjective + じゃない, Verb-negative potential form
Detailed explanation
The A は B ほど～ない grammar point is used to express that A is not as ~ as B in some aspect. It can be translated as 'not as...as' in English. This structure is commonly used with い-adjectives (without い) and な-adjective. For verbs, you can use the negative potential form.
Examples
Yamada-san wa Suzuki-san hodo se ga takakunai.
Yamada is not as tall as Suzuki.
Kono ringo wa ano ringo hodo amakunai.
This apple is not as sweet as that apple.
Kare wa watashi hodo benkyou ga dekinai.
He can't study as well as I can.
Kono resutoran wa ano resutoran hodo shizuka janai.
This restaurant is not as quiet as that restaurant.
Practice
Grammar content sourced from hanabira.org.