Foundation in English is the key!For example,vocabulary,reading,writing,and so on.
Speaking,listening easiest to resolve - with the environment,can rapidly increase,this did not issue.
There is,if you vocabulary,reading,writing to GRE level,or English,specifically eight,even if you did not speak before,and others from the dialogue,as long as the English-speaking environment 3 months half a year,you can foreigners in many areas and barrier-free communication;
And if you do not have these foundations,even if you soak in the foreigner bed,2 years later,but you can and others just skilled parents in a short,useless for work (unless you do some non-professional work).Of course,you can at this time two years eating what basic courses.