Combine two sentences by using the -ing forms as in the example:
Economics is a social science. It studies economy. – Economics is a social science studying economy.
– Economics is a science. It attempts to find economic laws.
– Economists make predictions. They form the basis of economic theories.
– There is a figure. It shows the interrelations between models, theories and reality.
– It is a text. It speaks about economics.
– It is a book. It speaks about some interesting observations.

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