чтении

In a sentence

• Я погрузился в чтение интересной книги.

  I immersed myself in reading an interesting book.

  Here, 'чтение' is in its nominative form, used as a noun meaning 'reading', referring to the activity.

• Во время чтения он делал заметки.

  During the reading, he took notes.

  Here, 'чтение' is in its genitive form after 'во время', again referring to the activity of reading, but in a temporal context.

• Учитель похвалил его за хорошее чтение текста.

  The teacher praised him for good reading of the text.

  Here, 'чтение' is in its accusative form as the object of the praise, referring to the quality of how he performed the reading task.