Dragoman expects its translators to use correlative conjunctions correctly.
The Oxford Dictionary of English Grammar defines a correlative as a pair of elements that join two similar parts of a phrase, clause, or sentence.
“Not only … but also” is one of the more frequently used correlative conjunctions that Dragoman translators use to translate Turkish copy into English.
What you have to keep in mind is that a verb that applies to both phrases must come right before “not only.”
Incorrect: Germany not only offers commercially competent education but also free of cost accommodation.
Correct: Germany offers not only commercially competent education but also free of cost accommodation.
You can further explore this English grammar topic here.