1. yes.
There are about 3000 living languages in the world, but only six of them are the most important ones.
=> có khoảng 3000 ngôn ngữ trên thế giới, nhưng chỉ có 6 trong đó là quan trọng nhất
2. More than 400 million people speak English as their mother tongue.
3. Another 400 million speak...