GRAMMAR

THE PASSIVE VOICE
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You have sent us the wrong items.
The wrong items have been sent to us.

You should have delivered this consignment last week.
This consignment should have been delivered last week.

Someone sent the order by sea mail instead of air mail.
The order was sent by sea mail instead of air mail.

A faulty connection could have caused the problems with the hard disk.
The problems with the hard disk could have been caused by a faulty connection.

You omitted the manuals from the order.
The manuals were omitted from the order.

We will not pay the invoice until this problem is rectified.
The invoice will not be paid until this problem is rectified.

PREPOSITIONS
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