こんなに・そんなに・あんなに・どんなに

そんなに is an adverb meaning "that much," "so much," or "to that extent." It refers to a degree or extent connected to something the listener has mentioned, done, or is associated with. It belongs to the こそあど (demonstrative) system:

• こんなに – this much (near the speaker)
• そんなに – that much (near the listener / referring to what was just said)
• あんなに – that much (something distant from both speaker and listener)
• どんなに – how much (question / exclamation)

With negative sentences – "not that much"

One of the most common uses of そんなに is in negative sentences, where it means "not that much" or "not so." It downplays or denies the degree of something the other person has implied.

With affirmative sentences – "that much / so much"

In affirmative sentences, そんなに emphasizes the extent or degree of something, often with a sense of surprise or reaction to what was said or observed.

Modifying verbs, adjectives, and adverbs

そんなに can modify verbs (