Ответ:

If Ann had practiced hard last week, she would have improved her intonation.

I wish I knew where they live.

I wish we had taken umbrellas, we got wet very quickly.

If you had bought everything beforehand, we wouldn't have wasted so much time.

If I were you, I would go to the South every summer.

1) practiced, have improved (Это связано с типами использования будущего времени после If, это 3-ий тип, кандишенал)

2) knew

3) we had taken

4) had bought, wouldn't have wasted (Тоже 3 кандишенал, где would)

5) if I were you, I would go (Это 3 кандишенал)

С учительницей решали!