A simple sentence is built from the minimum of a subject and a main verb. It can be very short in length (but doesn't have to be): 'The angry dog barks.' It puts across one simple idea: 'Rebecca sang.

An interest rate can be thought of as the cost of borrowing money, or the income you earn on saved money. Many or all of the products on this page are from partners who compensate us when you click to ...

Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives.

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