Translation of "Constructive" in Japanese

That's a constructive suggestion!

建設的な提案だよ。

She has constructive ideas.

彼女が建設的な構想を持つ。

Your opinion is very constructive.

君の意見はとても建設的だ。

Please try to be constructive when considering this matter.

前向きにご検討下さい。

All you ever do is nitpick. I wish you could say something more constructive.

人の揚げ足を取るばかりじゃなく、もっと建設的な意見を言ってくれないかな。