main verb to the past participle form. Revising the most common “verbs”
and their “past participle” forms could be an asset in describing diagrams.
For example
They
make
cars in factories. (
active voice
; there is a subject, “they,”
who do something.)
Cars
are
made
in factories. (
passive voice
, there
is no subject;
the object or the agent, “cars” has replaced it; the
sentence shows that something is done rather than who does it; “to
be” verb, “are” and the past participle, “made”
are put in the
sentence to form the passive structure.)
Workers
manufacture
wooden frames in a few steps. (active voice)
Wooden frames
are
manufactured
in a few steps. (passive voice)
They
collect
paper from recycling sites. (active voice)
Paper
is
collected
from recycling sites. (passive voice)
They
are processing
the raw material using special machinery.
(active voice)
The
raw material
is being
processed
using special machinery.
(passive voice)
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