YOU SAID:
Hello i am sad in a days work
INTO JAPANESE
こんにちは私は一日の仕事で悲しいです
BACK INTO ENGLISH
Hello I am sad at work one day
INTO JAPANESE
こんにちは私はある日仕事で悲しいです
BACK INTO ENGLISH
Hello, I have a day is sad at work
INTO JAPANESE
こんにちは、私は一日が仕事で悲しいです
BACK INTO ENGLISH
Hello, I am one day sad at work
INTO JAPANESE
こんにちは、私は仕事で一日悲しいです
BACK INTO ENGLISH
Hello, I am one day sad at work
You've done this before, haven't you.