I don't think it is a good idea that all the people in the world speak English.Different country has different language,which means different country has different culture,because language plays an important part in a country's culture.Just because of different languages,we have more chances to learn a foreign country.The development of a country's language is an very important part in the country's history.If all of us speak English,we will have problems in learning a country deeply. I don't think it is a good idea that all the people in the world speak English.Different country has different language,which means different country has different culture,because language plays an important part in a country's culture.Just because of different languages,we have more chances to learn a foreign country.The development of a country's language is an very important part in the country's history.If all of us speak English,we will have problems in learning a country deeply.