Hadn't

I hadn't recognized the importance of this document until you told me about it.

We hadn't so much as heard of her name.

The landlord told him to leave because he hadn't paid his rent.

If it hadn't been for Lindbergh's luck and his knowledge of flying, he could never have succeeded in crossing the Atlantic.

If he hadn't been tired, he would've gone.

If she hadn't made waves about it, she never would have got her money back.

If they hadn't found the vase, John would have been accused of stealing it.

If it hadn't been for his help, she might have drowned.

If it hadn't been for his advice, I couldn't have succeeded.

If it hadn't been for the storm, we would have been in time.

Hadn't we better apologize? Surely we hadn't to be late.