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Vitamin C
is known to be
good for treating colds.
Past reference
With past reference, the passive is followed by the past infinitive.
Smith
is believed to have left
England last week.
Past reporting verb
If the reporting verb is in the past, the past infinitive tends to follow, though
not always if the verb
be
is used.
People thought Sue had paid too much.
Sue
was thought to have paid
too much.
The police thought that the thief was still in the house.
The thief was
thought to still be
in the house.
Past reference with two objects
In this case there are two ways of making a passive sentence.
Everyone knows the portrait
was painted
by an Italian.
The portrait
is known to have been painted
by an Italian.
Continuous infinitive
Past and present continuous infinitives are also used.
Mary is thought
to be living
in Scotland.
The driver is thought
to have been doing
a U-turn.
Verbs with Prepositions
Ending a sentence with a preposition
It is possible to end a sentence with a preposition in a sentence where a prepositional verb is
made passive.
Somebody broke into our house.
Our house was broken
into.
By
and
with
With
is used after participles such as
filled, packed, crowded, crammed.
The train
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