YOU SAID:

The envelope had a letter inside.

INTO JAPANESE

封筒の中に手紙があった。

BACK INTO ENGLISH

Inside the envelope was a letter.

INTO JAPANESE

封筒の中の手紙でした。

BACK INTO ENGLISH

It was a letter inside the envelope.

INTO JAPANESE

それは、封筒の中の手紙でした。

BACK INTO ENGLISH

It was a letter inside the envelope.