Réponse :
1. have bought (present perfect)
2. bought (preterit)
3. was teaching (preterit)
4. has taught (present perfect)
5. had (preterit)
6. was (preterit)
7. has not yet arrested (present perfect)
8. arrested (preterit)
9. saw (preterit) - was (preterit)
10. had (preterit) - had (preterit)