(1) Card test function (how to turn over = manual)・You can learn about "initial expression (left)", "continuation expression (right)", and "composite expression (left and right)" by combining left and right in card format.・There is a "test function" that erases what you guessed in English corresponding to Japanese and leaves what you couldnt guess.・And you can use the "re-challenge test function" to repeatedly test and learn only what you couldnt guess in English.(2) Card listening function (turning method = auto)・You can listen to each of the "initial expression (left)", "continuation expression (right)", and "composite expression (left and right)" that combines left and right in card format.・Please play from Japanese to English and practice guessing the English before the English is played.・The interval between Japanese and English can be freely set from 0 to 10 seconds. If you can start with about 3 seconds and eventually be able to say it in 0 seconds, you are pretty close to speaking fluently.(3) Phrase search function・You can search for phrases in the app using Japanese or English keywords.・When you think "How do you say this in English?", please use the search function immediately.(4) Other useful functions・Since both text and audio are included, there is no need to carry teaching materials or CDs.・There is a playback speed adjustment function from "1x speed" to "3.5x speed".・ There are two types of playback methods: "order" and "random".・There are four types of playback order: "Japanese/English", "English/Japanese", "Japanese only", and "English only".・There is a "bookmark" function to add bookmarks to important phrases.・There is also a "page jump" function that allows you to jump to the phrase of your favorite number.