Grammar Guide

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Grammar Guide







University of Leicester




16 Feb 2010


Sentence structure

This guide explains how sentences are constructed and how different types of sentences are formed. It shows you how to punctuate each type correctly and how to combine different sentence types for effective written communication.

What is a complete sentence?

Sentences provide us with the framework for the clear written expression of our ideas. The aim in writing is always to write in complete sentences which are correctly punctuated. Sentences always begin with a capital letter and end in either a full stop, exclamation or question mark. A complete sentence always contains a verb, expresses a complete idea and makes sense standing alone.

Andy reads quickly. This is a complete sentence as it contains a verb (reads), expresses a complete idea and it does not need any further information for the reader to understand the sentence.

When Andy reads is an incomplete sentence. It contains a verb, but the opening word when tells us that something happens when Andy reads; we need more information to complete the idea.

When Andy reads, he reads quickly. This is now a complete sentence, as the whole idea of the sentence has been expressed. The following examples show the incomplete sentences in italics.

There is another theory. Which should not be ignored.

There is another theory which should not be ignored.


The proposal was finally rejected. Although they considered it.

Although they considered the proposal, it was finally rejected.

To check that you are writing in complete sentences, try reading your sentences aloud, pausing as indicated by the punctuation. Can each sentence stand alone as a complete thought? If further information is needed to complete the idea, then it is not a complete sentence.

Types of sentences

As well as being able to write in complete sentences, it is important to be able to use a variety of sentence types that are correctly punctuated.

Sentences are made up of clauses: groups of words that express a single idea. There are two types of clauses: independent clauses and dependent clauses. Independent clauses can stand alone as complete sentences. A dependent clause needs an independent clause to complete its meaning. Different types of sentences are made up of different combinations of these two types of clauses.

Simple sentences consist of just one independent clause; it requires only one punctuation mark at the end (a full stop, exclamation or question mark).

The essay was late.

Compound sentences are made by joining simple sentences. We join sentences which are closely related in content to make the writing more fluid. We can join simple sentences with a comma and a word such as: and, but, so, yet.

The essay was late, so he lost marks.

We can also join simple sentences with a semi-colon.

The essay was late; he lost marks.

Complex sentences are made when we combine an independent clause with a dependent clause. The dependent clause in the following example is in italics.

Because his essay was late, he lost marks.

When the dependent clause comes first, as in the example above, it is separated from the independent clause with a comma. When the sentence begins with the independent clause, there is no need to separate the clauses with a comma.

He lost marks because the essay was late.

Comparing these two examples, it can be seen that the emphasis tends to fall on the clause at the beginning of the sentence. Vary your placement of dependent clauses in order to emphasise the most important idea in the sentence. Common ways to begin a dependent clause are: although, as, because, even though, if, instead, through, when, whenever, where, while.

Whilst more than one dependent clause can be used in a sentence, they must always be combined with an independent clause to complete the idea. Again, the dependent clauses in this example are in italics.

Although there are many dissenters, many of whom were prominent citizens, the policy still stands today.

Different types of sentences can be combined to form compound-complex sentences. In the example below, the central independent clause combines two sentence types. It serves as both the ending of the complex sentence and the beginning of the compound sentence.

When considering owning a pet, you must calculate the cost, or the animal may suffer.

When punctuating a compound-complex sentence, apply the rules for both compound and complex sentences. The example above begins with a dependent clause separated from the central clause by a comma, as in the rule for complex sentences. At the end of the sentence the independent clause is joined by a comma and the word or, as in the rule for the compound sentences.

Using different sentence types

Once you are aware of the different types of sentence construction, you can then choose and correctly punctuate the most helpful type of sentences for the expression of your idea.

The following series of short sentences, whilst grammatically correct, are jerky and abrupt.

Jackie is confident. She is a good speaker. She is considered to be an excellent presenter. Everyone finds her interesting. No one has been critical. She is supportive of others.

These sentences can be combined to make more fluid writing by combining sentences which are closely related, using the rules described earlier.

Jackie is confident, and she is a good speaker. She is considered to be an excellent presenter. Everyone finds her interesting, and no one has been critical as she is supportive of others.

The following sentence is overly long and complicated. By shortening sentences that could confuse the reader, you can make the writing easier to follow.

If you consider buying a puppy, whatever age or breed, always consider the type of house you have, as this is the most important first step, because without considering this first you can find yourself with a dog that, despite your good intentions, you just cannot keep.

If you consider buying a puppy, whatever age or breed, always consider the type of house you have. This is the most important first step. Without considering this first, you can find yourself with a dog that you just cannot keep, despite your good intentions.


Use these guidelines to identify types of sentence construction in your own writing. To check the clarity of your sentence structure, try reading the writing aloud, stopping as indicated by the punctuation. Does each sentence stand on its own as a complete idea? Use the guidelines to either break an overly long sentence into shorter sentences, or join abrupt sentences together to make the writing more fluid. Varying the length and type of sentences whilst ensuring correct punctuation will improve the clarity of your written expression.

Using paragraphs

This guide explains how to make effective use of paragraphs in your writing. The function and features of a paragraph are explained, together with guidelines for using paragraphs to create a clear and coherent written structure.

What is a paragraph?

Writing of any length requires subdivision into a number of points or stages, and these stages are expressed in a paragraph. Paragraphs, whether denoted by a new line and an indentation or a line break, provide a structure for your writing. The end of a paragraph represents a significant pause in the flow of the writing. This pause is a signpost to the reader, indicating that the writing is about to move on to a different stage. Each paragraph should deal with one idea or aspect of an idea, and it should be clear to the reader what this main idea is.

How long should a paragraph be?

There is no absolute rule: very short or long paragraphs can work when used by an experienced writer. However, as a guideline, paragraphs should usually be no less that 2 or 3 sentences long and there should be 2 or 3 paragraphs per page of A4. The length of a paragraph depends on the idea being treated, but if a paragraph is shorter than 2 or 3 sentences, check to see if it is not really part of the previous or next paragraph. If your paragraph is longer than half a page, check to see if the idea would be better explained in two or more paragraphs.

When do I start a new paragraph?

Start a new paragraph for each new point or stage in your writing. When you begin a paragraph you should always be aware of the main idea being expressed in that paragraph. Be alert to digressions or details that belong either in a different paragraph or need a paragraph of their own.

How do I write a paragraph?

A paragraph can have an internal structure with an introduction, main body and conclusion in the same way as an essay  The example below shows a paragraph which:

  • introduces the paragraph's main point;

  • develops and supports the point;

  • shows the significance of the point made.

The previous example showed one style of paragraph. It is a useful rule always to have three stages in a paragraph: introduction, development and conclusion.

The introduction

The introduction makes the purpose of the paragraph clear so the reader can read the paragraph with this purpose in mind. It is usually necessary to show the place the paragraph has in the structure of the piece as a whole. This can be done with just a word (Nevertheless, However, Furthermore) or it may need a phrase (Another point to consider is....). In an essay, this might mean showing how the main idea of the paragraph answers the essay question. In some cases when the paragraph begins a new section, it may be necessary to write a separate paragraph which explains how the following section relates to the piece as a whole.

The development

The body of the paragraph should develop the idea that has been introduced at the beginning of the paragraph. This can be done by:

  • redefining the idea;

  • giving examples;

  • commenting on evidence;

  • showing implications or consequences;

  • examining opposing ideas.

The conclusion

The end of the paragraph can show the significance of the point, link back to the beginning of the paragraph, comment on the implications of the point as a whole, or make a link to the next paragraph. It is important not to end the paragraph with a digression or irrelevant detail. Each sentence in the paragraph should be part of the internal structure.

Another example of a paragraph using this three part structure is given below.

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