Meaning of でなければ in Japanese

Definition of でなければ

でなければ(denakereba) · でないと(denaito)

でなければならない(denakerebanaranai) · でなければいけない(denakerebaikenai) · でなければならぬ(denakerebanaranu)

(exp) having to be; must be; should be; ought to be →Related words: である , なければならない

If peace cannot be maintained with honor, it is no longer peace.

I should like to call on you this evening.

まず第一だいいちに、あなたは正直しょうじきでなければならない。

To begin with, you must be honest.

Whatever happens, you must keep calm.

それは、健康けんこうでなければ成功せいこうは望めないからだ。

It is because it can't hope for a success if it isn't healthy.

そうでなければ、学校がっこうに間に合ったのに。

If I had not overslept, I would have been in time for school.

ご迷惑ごめいわくでなければ、お願いおねがいしたいなあ。

If it's not too much trouble, I would like some help.

おご急ぎいそぎでなければ、もう少しもうすこしいているください。

If you are not in a hurry, please stay a little longer.

I was wondering if you could give me a lift, if it isn't too much trouble.

Only if it's not too much trouble.