31. Past Indefinite. Write the sentences in the negative.
1. I traveled about Africa last month.
2. Tom stayed at an expensive hotel last summer.
3. Margaret played golf the other day.
4. David swam in the ocean last week.
5. Fred helped about the house during the summer holidays.
6. We visited Greece twice last year.
7. He worked hard in the garden yesterday.
8. Molly watered flowers, plants and vegetables last Monday.
9. They called a doctor yesterday evening.

В Past Indefinite / Past Simple отрицательная форма образуется так:

did not / didn’t + глагол в начальной форме

Например:
traveled → did not travel
stayed → did not stay
swam → did not swim

Ответы:

1. I did not travel about Africa last month.

2. Tom did not stay at an expensive hotel last summer.

3. Margaret did not play golf the other day.

4. David did not swim in the ocean last week.

5. Fred did not help about the house during the summer holidays.

6. We did not visit Greece twice last year.

7. He did not work hard in the garden yesterday.

8. Molly did not water flowers, plants and vegetables last Monday.

9. They did not call a doctor yesterday evening.