は反対だ

be against

→ は
phrase Rare #22,226
be against Used to express opposition to an action, idea, or policy. The thing being opposed is marked with は or には; です and である are more formal variants of だ.
JA: 私はその計画には反対だ。
EN: I’m against that plan.

君が彼と一緒に外出するのには反対だ

I’m opposed to you going out with him.

とにかく私はあなたの意見は反対だ

Anyway, I disagree with your opinion.

私は子供のように扱われるのには反対だ

I object to being treated like a child.

彼の行為は言うことは反対だ

His actions contradict his words.

そこへ行くことには反対だ

I'm opposed to going there.

我々は日曜日に働くのは反対だ

We are opposed to working on Sundays.