属于【shǔyú】

属于 places the subject in a category: "counts as", "comes under". A noun always follows it, and the sentence reads as a classification.

With an owner after it, 属于 says who something belongs to. This is the formal use; everyday speech says 是…的.

The negative is 不属于. 没 doesn't go before it, because 属于 states a category rather than reporting an event, and for the same reason it doesn't take 了, 着 or 过.

Mistakes

属于 is followed by a noun – not an adjective, and not a possessive with 的.

• × 这个问题属于重要 → 这个问题很重要 / 这个问题属于重要问题
• × 这本书属于我的 → 这本书属于我 / 这本书是我的
• × 这块地没属于他 → 这块地不属于他