At the end of my first semester at my new university, I was giving the final exam for a lecture class in American Culture. Every week for one year, the students had listened to my 90-minute lecture, entirely in English, on various topics in American music, film and art. They had read articles, taken notes and written homework every week entirely in English.
Because the class was large, for the final exam, another professor from another department came to help distribute answer sheets, check student IDs and make sure no one cheated. After we got everything handed out, I reminded students, in English, to write their names and student numbers on the answer sheet and encouraged them to think carefully about the questions and write a lot on their answers. All set, I thought! "Good luck!" I said.
Stop! What am I saying? Stop! Look in the dictionary. Stop! Translate from Japanese. Stop! Think of the right grammar. Stop! Pronounce the word silently first. Stop! What did I say? Stop! Is that the right word? Stop! Did they understand my meaning? Stop! Stop! Stop!