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4A Identical twins Dave and Don Wolf
2 CHECK. Answer the questions. Write complete sentences.

1. How many sets of twins were at the festival?

Over 2OOO sets of twins were at the festival.

2. What were some of the festival events?

3. Who was doing serious work at the festival?

4. Why were Dave and Don Wolf a challenge for the researchers?

DISCOVER. Complete the exercises to learn about the grammar in this lesson.

A_ Look at these sentences from the newspaper article in exercise 1. Underline all of the verb forms.

1. One afternoon, while I was walking around, I stopped by a research tent.

2. Inside, technicians were photographing sets of twins, collecting their fingerprints, and
scanning their irises.

3. [looked very carefully at the brothers, but I didn’t see any difference at all.

B_ Work with a partner. Look at the sentences in exercise A and the verb forms you underlined.
Then check #) the correct box for each statement below.

Simple Past Past Progressive
verb + -ed / was/were (not)
didn’t + base + verb + -ing
form
This verb form shows that an action or situation...

1. continued for a period of time. O

2. started and finished without interruption. | |
3. interrupted another action. O

UNIT1 LESSON3 19
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