YOU SAID:

I better put on my seat belt.

INTO JAPANESE

シートベルトをしたほうがいいです。

BACK INTO ENGLISH

You'd better wear your seatbelt.

INTO JAPANESE

シートベルトを着用した方がよいでしょう。

BACK INTO ENGLISH

It is better to wear a seatbelt.

INTO JAPANESE

シートベルトを着用した方が良いです。

BACK INTO ENGLISH

It is better to wear a seatbelt.