炭素 たんそ いち よん ほうじゃなかったです
tansojū yonhōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 炭素14法

1. Wasn't carbon-14 dating.; Wasn't the carbon-14 method.

Past/Perfective
Negative
Polite
Casual Register