付く

1. Origins, structure, and basic meaning

• Structure: 付く is read as つく and is an intransitive verb meaning that something sticks to a surface or that a room or product comes with a feature.
• Basic usage: Paint sticking to a shirt appears in シャツに絵具が付く, while a room coming with a kitchen appears in 部屋に台所が付いている.

2. Common pitfalls and similar expressions

• Attachment and included feature
  • Context distinguishes material adhering to a surface from a facility included as part of something.
• Difference from 付ける
  • It is intransitive for something being attached or included, unlike the transitive verb for someone attaching it.