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Unit 2 READING 1

A n army is coming. It has a million
warriors, and they will kill every
living thing in their way. Who are these
terrible people? They are not people at
all. They’re ants! Army ants are different
from other ants. They are bigger and
meaner. Army ants live mostly in Africa
and South America.

Army ants stay in one area. They eat all the food there. Then they swarm.
This means they move into a new area. They eat everything in their path. (a)
The army ants can kill lizards, birds, pigs, and even horses! (b) During that
time, the army ants eat up to 50,000 insects and animals a day. (c) When
people in Africa and South America see army ants coming, they leave their
villages. (d) They know there is no way to stop this army.

English Usage

• verbs of perception + object + bare infinitive or ~ing
- hear, see, watch, notice and similar verbs of perception can be followed by
object + bare infinitive / ~ing form.
I heard him go down the stairs.
I saw her cross (crossing) the road.

116 Chapter 6 Science & Technology