Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

He is systematically advancing his work.

There is a planned blackout tonight, so please come home early.

We will hold a meeting to make a new business plan.

We made plans for the picnic next week.

Tomorrow's flight has been cancelled as planned.

Tomorrow's flight has been cancelled as planned.