Why are many languages difficult learn?

 Learning a language is always a challenge. For example, while learning German we find structures such as 'He is reading a book' difficult because this said in a different way in Germany. Sometimes only tricks like holding the nose help us learn the french sounds. It becomes very difficult to learn the language of other people whose culture is alien to us. assuming our own behavioral can lead to confusion and resentment. For instant, Westerners express a refusal by saying 'no' directly,in many asian cultures this is impolite and the resufal is communicated in indirect manner. That is why, learning a language is also includes the behavioral patterns of the people whose language we are learning.