釘刺 くぎさ試験 しけんじゃなかったです
kugi sashishi kenja nakattadesu

Noun
Desu Copula

The polite, past negative form of 釘刺し試験

1. Wasn't a nail penetration test.; Wasn't a nail puncturing test.

Past/Perfective
Negative
Polite
Casual Register