only + 状语放在句首,要部分倒装.
Only on such a trip can you learn so much about European artists. (介词短语)
Only by this means is it possible to explain it. (介词短语)
Only then did I realize the importance of English. (副词)
Only when the war was over was he able to get happily back to work. (从句)
这里的不算