1. This Is What Is Meant by Etiquette When You Are at Table:

1. The napkin is putonthe lap andnot usedas a tie.

2. A knife isneverput inone’s mouth.

3. Elbows arenotputon the table while eating.

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2. A Contest

1. A linguistic contest was organizedin our university.

2. All university students studying the English language were welcomedto

participate in the contest.

3. Students were offered to writedifferent lexical and grammatical tests.

4. Students were asked to presenttheir own reports on the vital social,

educational and country study topics.

5. The winners, of course, were awarded in different ways.

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3. Contributing to the Environment Protection

1. An important decision was madeby the city government last night.

2. All cars will be bannedfrom the city centre as people’s health is being

seriously affected by pollution.

3. Only bicycles and buses will be allowed to enterthe city centre.

4. Plans for a new environment police force are being made.

5. After all, something must be donebefore it’s too late.

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The Passive with by and with

by + agent
In the Passive we use by + agent to say who or what did the action.	Most children are strongly influenced by their parents. (Parents do the action.)
We put the agent (= a person who performs the action) into the Passive only if it adds information.	Iliad was written by Homer. (The agent is not omitted; it adds information; emphasis on the agent.)
When the agent is unknown, unimportant or obvious from the context, it is omitted.	The church was built in 1815. (unimportant agent) He has been arrested. (obviously by the police)
Agents such as: someone, people, I, you, etc. are omitted.	Somebody helped him.  He was helped (by somebody). Somebody took my pen.  My pen was taken (by somebody). (unknown agent, it is omitted.)
In Passive questions with who, whom, which we do not omit by.	Who gave you this book?  Who were you given this book by? Who signed the letter?  Who was the letter signed by?