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2 CHECK. Correct the error in each sentence according to the information in the conversation.
frogs
. Many people said that they saw lizards fall from the sky.

Some biologists have tried to explain frog rain.

. Asnowstorm is a possible reason for frog rain.

Strong winds can transport frogs short distances.

Scientists agree about the causes of frog rainfall.

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

Find these sentences in the conversation from exercise 1. Write the missing words.
Then circle the modals.

. That (a) be true!

. That___ CSCS they take the reports seriously, right?

. Well, according to some scientists, it _________ watterspouts.

right explanation.
. That__C—C—C—‘“CSCSCSCSSCSSCC#d
. Thecause__ CSS aa. powerful flow of air. . .

Look at the modals in exercise A again. What do they mean in this context? Write each
modal in the correct column.

Very Certain
cant Not Certain

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LESSON1
UNIT8