What's the main language used in PhD courses in Germany for most of the fields ? CS, chemistry...
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In Germany, there usually are no PhD "courses", except for some specialized programs ("Graduiertenkolleg"), which are still in the minority.
Most PhD students conduct research from day 1, under the supervision of a specific advisor. The language of communication will depend on the advisor and the student. Working with international students is not an issue for most advisors.