Proficiency in the mother tongue is a head start for learning others.精通本国语对以后学习其他语种是很有利的。The classes consist of immigrants, and students who will return to their home countries at the end of the course. The latter group are preparing for the Cambridge Proficiency Certificate.这些班级由移民学生和学成后要回国的学生组成。后者正在准备剑桥英语能力证书考试。