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Present Perfect unu Past Simple.
1. I ... (do) this exercise before.
2. I ... (do) this exercise two minutes ago.
3. We ... (go) to school since the first form. .
4. We ... (go) to school yesterday.
5. You ... (see) a horse last week.
6. You ... (never/ see) a horse.
7. He ... (just/say) that.
8. He ... (say) that a minute ago.
9. They ... (already/ have) breakfast.
10. They ... (have) breakfast at 2 o'clock.

Ответ:

1. I have done this exercise before.

2. I did this exercise two minutes ago.

3. We have gone to school since the first form. .

4. We went to school yesterday.

5. You saw a horse last week.

6. You have never seen a horse.

7. He has just said that.

8. He said that a minute ago.

9. They have already had breakfast.

10. They had breakfast at 2 o'clock.

Объяснение:

• Present Perfect - время, которое соединяет прошлое с настоящим. Его маркерами являются следующие слова: before (до этого момента, раньше), since (с, с тех пор как), never (никогда не), just (только что), already (уже).

• Past Simple - время, которое описывает только те действия, которые происходили в прошлом. Здесь мы обязательно указываем следующие маркеры: two min ago (2 минуты назад), yesterday (вчера), last week (на прошлой неделе), at 2 o'clock (в 2 часа). Как мы видим, все маркеры имеют значение "в прошлом".

Объяснение:

1. I have done this exercise before.

2. I did this exercise two minutes ago.

3. we have gone to school since the first form.

4. we went to school yesterday .

5. you saw a horse last week.

6. you have never seen a horse.

7. he has just said that.

8. he said that a minute ago.

9. they have already had breakfast .

10. в этом предложении надо не в present perfect и не в past simple, а в past progressive.