に賛成ですか、反対ですか

are you for or against it?

→ に

phrase Rare #40,018

are you for or against it? Used to ask whether someone supports or opposes a person, idea, plan, or issue. The noun or topic before に identifies what they are being asked about.

JA: この提案に賛成ですか、反対ですか。

EN: Are you for or against this proposal?

私の計画に賛成ですか、反対ですか。

Do you agree or disagree with my plan?

あなたはこれに賛成ですか、反対ですか。

Do you agree or disagree with this?

この計画に賛成ですか、反対ですか。

Are you in favor of or opposed to this plan?

あなたは妊娠中絶に賛成ですか、反対ですか。

Are you for or against abortion?