YOU SAID:

letter box is full with newspapers

INTO JAPANESE

レターボックスは新聞でいっぱいです

BACK INTO ENGLISH

The letter box is full of newspapers

INTO JAPANESE

手紙の箱は新聞でいっぱいです

BACK INTO ENGLISH

The box of letters is full of newspapers

INTO JAPANESE

手紙の箱には新聞がいっぱいです

BACK INTO ENGLISH

There are lots of newspapers in the box of letters

INTO JAPANESE

手紙の箱には新聞がたくさんあります

BACK INTO ENGLISH

There are many newspapers in the letter box

INTO JAPANESE

レターボックスには多くの新聞があります

BACK INTO ENGLISH

There are many newspapers in the letter box