!!! It is mandatory to update your speech synthesizer Google TTS https://play.google.com/store/apps/details?id=com.google.android.tts and load Czech in Android Settings (Language & input ---> TTS Settings). Appendix "Czech plus" consists of 8 sections: "Learn the word" - section for storing the Czech words. Context sentences help to introduce three-dimensional image and improve memorizing new words. "Writing the word" - a section for training Czech spelling of words (spelling). "Make up senten