YOU SAID:

In the box have steak in the box

INTO JAPANESE

箱の中にはステーキが入っています

BACK INTO ENGLISH

There is a steak in the box

INTO JAPANESE

箱にはステーキが入っています

BACK INTO ENGLISH

The box contains steak

INTO JAPANESE

箱にはステーキが入っています

BACK INTO ENGLISH

The box contains steak