It is difficult for a foreign language beginner to master a

It is difficult for a foreign language beginner to master a It is difficult for ____ foreign language beginner to master It is necessary for us to master a foreign language.请问for us To master a foreign language is necessary(用it is改句） It is()for you to ()a foreign language. I think that it is important to master a foreign language.(同 I think that it is important to master a foreign language.(改 I think that it is important to master a foreign language.（同 英语改为简单句I think it is important to master a foreign language. be of如何理解It is of great help to master a foreign language.可不 it is difficult for us to learn a foreign langua 16.To master a foreign language,______ .