This lesson introduces a new way to turn verbs into nouns – using の.
[Verb (plain form)]の
We have already learned that の can act as a noun when modified by an adjective: 赤いのを ください。Please give me the red one. Not surprisingly, の can also be used with verbs.
[Verb (plain form)]のは [adjective]です。
This structure can be used to make a verb the topic of the conversation, so you can describe it in more detail.
[Verb (plain form)]のが[adjective]です。
The topic of the conversation can be a person, with the [verbの] phrase taking が. This is used to describe the verb in relation to whoever the topic is.
[Verb (plain form)]のを[verb]
A verb の combination can also take を to become the object of another verb.
[Predicate(plain form)]のは [noun]です。
When we make a verb the topic of the conversation, we don’t have to use an adjective describe it, we can also use a noun to say what it is.
We’ve learned that when とき is modified by a plain-form predicate it refers to the time that is described by the predicate. Because とき is a noun, it can take any particle that a noun can take.