Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.
わあ
waawow!; whoa! (surprise)expression
Example sentences2
わあ、このケーキすごくきれい！
waa, kono keeki sugoku kirei!
Wow, this cake is so pretty! casual
わあ、びっくりした！急に出てこないでよ。
waa, bikkuri shita! kyuu ni detekonaide yo.
Wow, you scared me! Don't jump out like that. casual