Top Bun or Topic Sentence or Introduction This page explains how the top bun of a hamburger is like the topic sentence of a paragraph or the introduction to an essay or thesis. The top bun is connected to the bottom bun, or the conclusion, which reflects its content 

The Top Bun

The topic sentence is a hard concept for students to learn.

But in many ways, topic sentences are easy if you think of them a similar to the top bun of a hamburger.

The top bun cannot be ten feet wide. It must limit itself to the width of the ingredients.

In the same way, the topic sentence has to be limited, and basically tell you what's going to be in the burger. If I write, "I love New York," it doesn't give any sense of the paragraph will include.

But if I add, "for three reasons," now I know what's coming in the paragraph or essay -- the three reasons.

Basically, you're making the bun fit the burger.

Technically, the "topic" of the paragraph or essay would be "I love to visit New York." The "controlling idea" would be "for three reasons."

This works with any subject.

I like ice cream for three reasons.
Houses are better than apartments for three reasons.
My favorite book is The Cat in the Hat for three reasons.

While there are slight modifications depending on the essay type, this basic structure works for all academic writing.

Now, let's move on to the first reason, the lettuce.

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