It is generally considered that learning how to use the correct TOEFL essay structure is the first step to increase your writing score.
Your TOEFL essay should be about four – five paragraphs long, and it is to consist of three parts: the introduction, the body and the conclusion. Each part of the essay plays it role, and reader expects to receive some certain information from every part of the essay.
You should not underestimate the importance of the structure of your TOEFL essay. It is also necessary to mention that not using this structure is considered to be one of the biggest mistakes, ever made.
So, here comes the brief explanation of each of these three main parts of the TOEFL essay structure:

Introduction
The first paragraph of your essay is called introduction. This is so because a couple of the first sentences of this paragraph simply introduce the reader to the topic of the essay. Introduction also includes thesis statement – the last sentence of the paragraph, which clearly states the opinion of the author of the essay. Thesis statement is generally considered to be the most important sentence of the essay.

Body
The body of your TOEFL essay should be about two or three paragraphs long. Each paragraph is to begin with a topic sentence, which informs the reader what the rest of the paragraph will be about. All the rest of the sentences of the paragraph are called supporting ideas. The reason of it is because they play a role of “supporters” of the topic sentence.

Conclusion
The conclusion is the name of the last paragraph of the essay. The thesis statement is restated in it. In addition, conclusion also provides the reader with brief summary of the main points and ideas of the essay. This last paragraph should be about 3 sentences long.

It is extremely important to keep to the essay structure, because when you do this in your essay, your ideas are presented in a clear way and in a logical order. You essay really seems like flow, which makes it much easier for the reader to understand. And even in case if you make several spelling or grammatical mistakes, your essay, written in this structure, will be much better than the one, in which the grammar and spelling are perfect, but the author of which did not keep to the necessary structure.