Meaning
The nominalizer の lets an action become the object of 忘れる or 知る, or the focused element in のはNです.
Formation
- Plain form + の + を / は / が: 消すのを忘れました
- の is a concrete observed action, こと a general fact
When to use it
- Core use
- Turns an action into an object or sentence focus
Example
電気を消すのを忘れました
I forgot to turn off the light.
Important notes
- Pay attention to the word form before the construction and to the particles around it.
Common mistakes
- Do not translate the pattern word for word; first identify its function in the whole situation.