Instrument is a thematic relation used for noun phrases that express use as a tool or method used to conduct the event described by the predicate. For example, the phrase with a rock is the instrument in Calvin broke the window with a rock. In English, instruments are typically introduced using the preposition with or the gerund using. Gaelic uses the preposition le.
The link below takes you away from the Gaelic Wiki to Wikipedia. Since wikipedia pages can be edited by anyone, they often contain inaccurate information. So be careful!
- Carnie, A. (2013) Syntax: A Generative Introduction. 3rd Edition. Wiley Blackwell.