need to practice English

My last diary is in May! XD

I started working in foreign capital company in April.
HR department members had told me that you surely need English.
But I hardly use English because of my department property now.
In my department, there are no foreign staffs!

According to co-workers, we will have to talk in English if a communication is in among Japanese people at early date.
I have gotten careless for English.
If I have to use only English from tomorrow, I can't do work!