Ex. 272. Choose the correct tense (Past Indefinite or Present Perfect).

1. Since the beginning of the 20th century, scientists have made many important discoveries.

2. I learned to read and write French when I was a child, but now I have forgotten everything.

3. Science advanced a great deal in the 20th century.

4. Last night I had some free time, so I spent it on my hobby.

5. Who turned on the radio? - Ann did it a few minutes ago.

6. She has already tried on several pairs of shoes, but she has not chosen a suitable pair yet.

7. When I was in Paris, I bought a lot of fashionable dresses.

The correct tenses are:

• 1. Since the beginning of the 20th century, scientists have made many important discoveries.
• 2. I learned to read and write French when I was a child, but now I have forgotten everything.
• 3. Science advanced a great deal in the 20th century.
• 4. Last night I had some free time, so I spent it on my hobby.
• 5. Who turned on the radio? Ann did it a few minutes ago.
• 6. She has already tried on several pairs of shoes, but she has not chosen a suitable pair yet.
• 7. When I was in Paris, I bought a lot of fashionable dresses.

Use Present Perfect when the result is important now or with words like since, already, yet. Use Past Indefinite for finished past time: last night, a few minutes ago, when I was a child, in the 20th century.

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