In Japan, we study English as compulsory education from junior high school.
I think the method of Japan's English education should be changed.
Because it's not useful for actually speaking English, only for taking exams.
English is not just the memorization of formulas.
For example,when I was a junior high school student, my English teacher was a Japanese who couldn't speak English.
And I learned about the "must + verbs = have to + verbs" and "should = had better" at that time.
But they don't have exactly the same meanings, don they?
I learned they had the same meanings.
but I didn't learn about the detailed difference between them.
According to a native English speaker who teaches English at junior high school in Japan,it appears that the textbook contains an unnatural sentence.
I wish I could speak English !
Have you tried consuming as much English stuff as possible? English books, English movies, English music, English everything. Stuff that is made by English speakers for English speakers.