Exercise 4. expressing past time: using lime clauses. (chart 2-7)
section 2
ase
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complete the passage from section 1 with the correct form of the text in parentheses. click on the
light bulb icon to review the grammar chart.
iu
ols
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check chapter 2 vocabulary at the end of this chapter to see the definitions of the following words:
continents, hunt, dominate, extinct
staal
ef
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when dinosaurs
(live) on earth, the planet was much different. several hundred million years ago, there
results
la

were not seven continents. the earth
(has) just one very large piece of land, with an ocean around it
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el
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met
ref
"
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dinosaurs first
gin) to walk the earth about 230 million years ago. they lived in many places all over
elle
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f
e-
lases
m-
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the earth. dinosaurs
(was) different from each other in their size and in their behavior.
en
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some dinosaurs
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(were eating) only plants. the larger ones got their food from the tops of trees, and the
smaller ones ate the plants and bushes near the ground. other dinosaurs were meat-eaters and
other animals for food.
(hunt)
dinosaurs dominated animal life on earth until they
(become) extinct about 65 million years ago. no
dinosaurs
(are living) when the first human beings appeared, about 2 million years ago