YOU SAID:
I've got to run errands
INTO JAPANESE
用事を実行しなければならない
BACK INTO ENGLISH
I have to carry out errands
INTO JAPANESE
用事をしなければならない
BACK INTO ENGLISH
I have to do business
INTO JAPANESE
私はビジネスをしなければなりません
BACK INTO ENGLISH
I have to do business
Come on, you can do better than that.