だい よん しゅ郵便 ゆうびん ものじゃないです
daiyon shu yūbimmonojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 第四種郵便物

1. It's not fourth-class mail.; It isn't fourth-class mail.

Negative
Polite
Casual Register