английского

английского

"Of English" or "English" (possessive/adjective form).

Here, 'английского' is used in the genitive case because it follows the verb 'изучаю' which governs the genitive case when implying an object of study.

Я изучаю английского для работы.

I am studying English for work.

In this case, 'английского' is used to describe the language of the book, wrong case used.

У меня есть книга на английского.

I have a book in English.

Here, 'английского' is in the genitive case as 'изучении', meaning 'study', requires the genitive case for the object of study.

Трудности в изучении английского часто вызывают вопросы.

Difficulties in studying English often raise questions.