Shitsureina koto-ga nai yō-ni ki-o tsukenakucha. (We should be careful not to do anything impolite.)

Situation 1: Ms. Gray and Mr. Mita are talking about a client who is visiting the office today.

グレイ: きょうは大事なお客さまがいらっしゃるから、失礼な ことがないように気をつけなくちゃ。