釘刺 くぎさ試験 しけんではありませんでした
kugisashi shikendewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 釘刺し試験

1. Was not a nail penetration test.; Was not the nail penetration test.

Past/Perfective
Negative
Polite
Formal Register