I havent got a textbook. I must buy one.
I dont like these yellow flowers. Let me have some red ones.
<span>This story is more interesting than that one.</span>
This exercise is more difficult than the one we did yesterday.
<span>My tv set is old. I must buy a new one.</span>
I havent got a flag. I have to buy one.
<span>I dislike these books. Give me another ones.</span>
<span>This river is longer than that one.</span>
1Although the content and character of economics cannot be described briefly, numerous writers have attempted that.
2 <span>An especially useless, though once popular, example is: «Economics is what economists do.»
3</span> notable economist of the last century Alfred Marshall called economics «a study of mankind in the ordinary business of life.»
4<span>We may make better progress by comparing economics
with other subjects. Like every other discipline that attempts to
explain observed facts (e.g., physics, astronomy, meteorology),
economics comprises a vast collection of descriptive material organized
around a central core of theoretical principles. The manner in which
theoretical principles are formulated and used in
applications
varies greatly from one science to another. Like psychology, economics
draws much of its theoretical core from intuition, casual observation,
and «common knowledge about human nature.» Like astronomy, economics is
largely nonexperimental. Like meteorology, economics is relatively
inexact, as is weather forecasting. Like particle physics and molecular
biology, economics deals with an array of closely interrelated phenomena
(as do sociology and social psychology). Like such disciplines as art,
fantasy writing, mathematics, metaphysics, cosmology, and the like,
economics attracts different people for different reasons: «One person’s
meat is another person’s poison.» Though all disciplines differ, all
are remarkably similar in one respect: all are meant to convey an
interesting, persuasive, and intellectually satisfying story about
selected aspects of experience. As Einstein once put it: «Science is the
attempt to make the chaotic diversity of our sense-experience
correspond to a logically uniform system of thought.»
</span>
2You've never gone to a volcano.
3They've never gone to the bottom of the ocean.
4I've never visited an island.
How often are you going to the theatre?
<span>I dion't get on very well with my brother. When we were small we </span> always gave in each other. But now we quarell. But one day we decide that we should live in peace. He has given up his bad habit to cry at me. I like giving away his secrets to our mother. I promise not to do it. We try to get out quarells. This worked out plan helps us to be good friends.