If it is not possible to memorize vocabulary, I will have to create my own lessons in the coming weeks. I would be happy about this information. You need to develop a feeling for the language. It certainly is one of the reasons that a student from abroad is not as good in English as people who were born in America. This is an obstacle for all students and a challenge for the educational system. I teach at the university of natural sciences. I have studied at the ETH in Zurich. At that time I started learning Spanish and I found Vocabulix. Since then I'm using it regularly with joy.