Pluskvamperfekti ja imperfekti:

Practice here:

http://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_simple_past.htm

More exercises on English tenses:

http://www.englisch-hilfen.de/en/exercises_list/zeitformen.htm

Watch this:


Practice here:
http://www.perfect-english-grammar.com/question-tags-exercise-1.html

1. osa: arise - come
2. osa: cost - give
3. osa: go -mislead
4. osa: mistake - show
5. osa: shrink - stink
6. osa: stride - write