Формы причастия

	Active	Passive
Participle I	using использующий; используя	being used используемый	Выражает действия, одновременные с действием глагола-сказуемого
Participle II	–	used использованный, который используют, при использовании	Выражает действие, одновременное с действием глагола-сказуемого или предшествующее ему.
Perfect Participle	having used использовав	having been used когда / после того, как использовали	Выражает действие. предшествующее действию глагола-сказуемого.

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Introduction

Computers are used nowadays for many different kinds of work, e.g. in offices, banks factories, hospitals, universities and schools. Their use is becoming more widespread as cheaper and smaller computers become available. People can now buy small personal computers.

What are computers? And what can they be used for? Computers are electronic systems. They are used for handling, or processing, facts and figures. The facts and figures processed by a computer are usually known as data. Computers can process large amounts of data very quickly.

The data fed, or put, into the computer is input data. Input data is processed according to a set of instructions called a program. Both input data and programs are needed for processing. The results of processing are output data. Very often, the output data is new and useful information. “Information” here means output data useful for making decisions.

A computer can be used to process many different types of data. For example, a scientist can use a computer to do numerical calculations. A businessman can use a computer to analyse a list of customers or stock (stores held by the business). An engineer can use a computer to produce diagrams or plans. The table below shows some different types of process and data for different users:

User	Process	Data
scientist	calculating	numbers (i.e. numerical data)
businessman	analysing	names, addresses (i.e. non-numerical data)
engineer	designing	colours, patterns
manufacturer	controlling	measurement (volume, time, temperature, speed)
hospital	analysing, plotting	electrical signals
library/shop	information retrieval	stock details

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