How do you spell seize when adding ad ed?

The word "seize" does not take the suffixes "-ed" or "-ad" directly.

Here's why:

* "Seize" is an irregular verb. It doesn't follow standard verb conjugation rules.

* The past tense of "seize" is "seized".

* The past participle of "seize" is also "seized".

So, you would not spell it "seized" or "seized". It's simply "seized" for both past tense and past participle forms.