一…也不 / 一…都没【yī … yě bù / yī … dōu méi】

一 + measure word + noun, followed by 也 or 都 and 不 or 没, means "not a single one". The phrase with 一 comes before the verb, even when it is the object.

也 and 都 mean the same here. The measure word has to match the noun: 一本书, 一件衣服, 一口饭.

不 or 没

The negative follows the usual split. 没 says it didn't happen; 不 refuses, or describes a habit or a state.

The object moves forward

English puts "a single book" after the verb. Here it has to come before it. Left after the verb, it no longer means "not a single".

• × 我没看一本书 → 我一本书也没看
• × 他没说一句话 → 他一句话也没说

A verb measure word works the same way: 一次 "once", 一遍 "one time through".

With an adjective rather than a counted noun, the frame is 一点儿也不: 一点儿也不累 "not tired at all".