skillfully?

For example, which will swell when I talk in English when an American good at Japanese and a Japanese good at English talk in English?
Which will it be that the feeling of the person becomes the words skillfully?
Because the thing called all skillfull is how to choose words and personality and a human being in the essence, The quality of the conversation should be fixed what you changed through a result, words.
Then you should think that human nature cultivated in the different language zone by culture and custom makes a base of the communication.