So it's asking you to explain the difference between past tenses of preterite and imperfect tense, and it asks for you to say it in English
The imperfect tense is something that happened in the past but has not exact start or exact end. Hablaba is a good example of the imperfect, as it has no exact beginning or end
Preterite, on the other hand, is again something that happened in the past but this time it was completed. Hablaste is another good example as it shows that it was completed