O
h, the power of suggestion. Advertisers know it well—and so do writers. They know that they can
get an idea across to their readers without directly saying it. Instead of providing a topic sentence
that expresses their main idea, many times, they simply omit that sentence and instead provide
a series of clues through structure and language to get their ideas across.
Finding an implied main idea is much like finding a stated main idea. If you recall from Lesson 2, a main
idea is defined as an assertion about the subject that controls or holds together all the ideas in the passage. There-
fore, the main idea must be general enough to encompass all the ideas in the passage. Much like a net, it holds
everything in the passage together. So far, all but one of the passages in this book have had a topic sentence that
stated the main idea, so finding the main idea was something of a process of elimination: You could eliminate
the sentences that weren’t general enough to encompass the whole passage. But what do you do when there’s no
topic sentence?
You use your observations to make an inference—this time, an inference about the main idea or point of
the passage.
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