Breakdown of dankaigoto ni taisaku wo kaerukoto ga taisetu desu.
ですdesu
to be
をwo
direct object particle
がga
subject particle
〜こと〜koto
verb nominalizer
段階ごと にdankaigoto ni
at each stage
対策taisaku
measure
変るkaeru
to change
大切taisetu
important
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Questions & Answers about dankaigoto ni taisaku wo kaerukoto ga taisetu desu.
What does 段階ごとに mean?
段階 means “stage” or “phase,” and ごと attaches to a noun to express “every” or “each.” Adding the particle に turns it into an adverbial phrase indicating frequency or timing. So 段階ごとに literally means “at each stage.”
Why is the particle に used after 段階ごと?
ごと by itself means “every” or “per.” To make it modify a verb (i.e. tell us when or how often the action happens), you add に. This makes 段階ごとに an adverbial phrase that modifies the verb 変える.
What is the function of こと in 変えることが大切です?
The particle こと nominalizes the verb phrase 変える (“to change”) into a noun phrase (“changing”). This allows the phrase to be the subject or object of other grammar points—in this case, letting 大切 (an な-adjective) attach, and letting us use the subject marker が.
Why do we use が after 変えること, and could we use は instead?
In 変えることが大切です, が marks 変えること as the grammatical subject (“What is important is changing…”). You can say 変えることは大切です, which puts more emphasis on the topic (“As for changing…, it is important”), but が is more neutral and common in this pattern.
Why is を used after 対策?
Because 対策を変える is “to change measures/strategies.” Here 対策 (“countermeasure; measure; strategy”) is the direct object of 変える (“to change”), so it takes the object-marking particle を.
What part of speech is 対策?
対策 is a noun meaning “measure,” “countermeasure,” or “strategy.” It stands alone as the object in 対策を変える.
Could we omit こと and say 段階ごとに対策を変える大切です?
No. Without こと, 変える remains a verb and can’t directly modify 大切 (a な-adjective). You need こと to turn 変える into a noun phrase so that 大切です can attach properly.
Why does the sentence end with です?
です is the polite copula, making the sentence polite. Without it, the sentence would be more casual or incomplete (…大切 would need another copula or be part of a longer structure).