1. I wanted to learn English (or another language) because…

    I want to improve my English because I like exploring different cultures, I’d like to communicate with people with different views.
    2. I don’t mind working hard when/if …

    I don’t mind working hard when I could gain a sense of achievement.
    3. I lose motivation when/if…

    I lose motivation when  I found a course that didn’t suit me, such as its main goals and course design. At work, I would lose motivation if it’s easy for me to do.