clause before a noun — relative clauses and ga-scope (Cure Dolly)

The machine

天気が良い日に洗濯をします。 “weather — is-good — day — at, — laundry — do.” = “On a day when the weather is good, [I] do the laundry.”

piece	role
天気が良い	relative clause modifying the noun — “the weather is good”
日	head noun the clause attaches to — “day [that/when] …”
に	time particle — “on” that day
洗濯をします	main verb — no marked subject (topic-drop “I”)

Read order: the modifier comes first, then you land on the noun. There is no that/which — the noun itself does the joining. Same shape as いつでも練習できる相手 (nanode-since).

ga is scope-local

A が belongs to its own clause, not the whole sentence:

layer	が?	subject
inner clause	天気が良い	the weather
outer sentence	(none, dropped)	I

The inner が cannot reach します because します is in a different layer. Layer count = が count when clauses nest.

The seal comes from the NOUN, not に

• [天気が良い] 日 に洗濯… — 日 swallows the clause → が sealed inside (local)
• 天気が良い。洗濯をします — no noun in between → 天気が is the outer subject (global)

Rule: clause directly followed by a noun = relative clause = local が. Clause followed by a main predicate = the が can be the outer subject.

の vs a head noun — same sealing, different job

	の (nominalizer)	日 (head noun)
what	dummy noun (“the one / the thing / the fact”)	real noun (“day”)
does	substitutes for a noun	is the noun modified
example	天気が良いのが好き = I like that the weather is good	天気が良い日 = the day the weather’s good
seals inner が?	✓	✓

Both swallow the clause because both are nouns sitting after the clause.

Three roles of の — don’t mix them

role	example	meaning
possessive	私の本	my book
nominalizer	良いのが好き	the good one / that it’s good
subject in a relative clause (が→の conversion)	天気の良い日 = 天気が良い日	the day the weather is good

That last one is a subject marker, not a possessive and not a nominalizer — legal inside relative/subordinate clauses. 天気の良い日 is not “weather’s day”.

Source

Ebot lesson — Cure-Dolly gloss of 天気が良い日に洗濯をします (user question: ga scope, 日 as head noun, の analogy).