1 Study the sentences in the tables. How do we form past passive sentences? Complete the rules.
Active verb
Object
Subject
A
c People
used
the fur.
Humans
hunted
mammoths.
V
е e
Hunters
didn't cause
the mass
extinction.
Subject
be + past participle by + agent
P
a
The fur
was used
by people.
S
S
Mammoths were hunted
by humans.
v The mass
e
extinction
wasn't caused
by hunters.
