YOU SAID:

The mice in my room have begun to write letters.

INTO JAPANESE

私の部屋のネズミが手紙を書き始めました。

BACK INTO ENGLISH

The mouse in my room began to write a letter.

INTO JAPANESE

私の部屋のネズミが手紙を書き始めた。

BACK INTO ENGLISH

The mouse in my room began to write a letter.