It's a weight off my shoulders.
肩の荷が下りた
It's a wonderful film. Eat your heart out, Hollywood.
これはすばらしい映画だ．悔しいだろう，ハリウッドよ．
It's a year to the day since I married.
結婚してちょうど１年です
It's about that long.
これくらいの長さだ
It's about [high] time (that) we started working on the project.
その計画にとりかかる時期が来ている（◆that節中の動詞は過去形がふつう）
It's against my better judgment, but ....
不本意ながら…
It's all because of you.
きみのせいだ
It's all in the mind.
みんな気のせいだ
It's all in the past.
((略式))すべて昔のことだ（忘れよう）
It's all on expenses.
それはすべて会社持ちだ
