Communication is very important, more so on the global stage. Fluency in English is often a mistaken measure of intelligence in India. Out there, do not be tempted to flaunt your superiority if the other person is not equally gifted. Even if you communicate fluently, it is your responsibility to leave no scope for misinterpretation. Repeat, demonstrate, spell it out—take no chances. Make a conscious effort to avoid mistakes—those tend to stay in memory longer than your pluses.