Introduction: This page contains some basic information about sentence structure (syntax) and sentence types. It also includes examples of common sentence problems in written English. ESL students who understand the information on this page and follow the advice have a better chance of writing well.
Subject/predicate: All sentences are about something or someone. The something or someone that the sentence is about is called the subject of the sentence. In the following sentences the subjects are shown in red. Note how the subject is often, but not always, the first thing in the sentence.
- John often comes late to class.
My friend and I both have a dog named Spot. - Many parts of the Asian coastline were destroyed by a tsunami in 2004.
- The old hotel at the end of the street is going to be knocked down to make way for a new supermarket.
- Sitting in a tree at the bottom of the garden was a huge black bird with long blue tail feathers.
- The grade 7 Korean boy who has just started at FIS speaks excellent English.
- On Saturdays I never get up before 9 o'clock.
- Before giving a test the teacher should make sure that the students are well-prepared.
- Lying on the sofa watching old films is my favourite hobby.
The predicate contains information about the someone or something that is the subject. The example sentences above are shown again, this time with the predicate marked.
- John often comes late to class.
My friend and I both have a dog named Spot. - Many parts of the Asian coastline were destroyed by a tsunami in 2004.
- The old hotel at the end of the street is going to be knocked down to make way for a new supermarket.
- Sitting in a tree at the bottom of the garden was a huge black bird with long blue tail feathers.
- The grade 7 Korean boy who has just started at FIS speaks excellent English.
- On Saturdays I never get up before 9 o'clock.
- Before giving a test the teacher should make sure that the students are well-prepared.
- Lying on the sofa watching old films is my favourite hobby.
Simple subject/predicate: As you can see from the example sentences above both the subject and the predicate can consist of many words. The simple subject is the main word in the subject, and the simple predicate is the main word in the predicate. The simple subject is always a noun/pronoun and the simple predicate is always a verb. In the following sentences the simple subject is shown in red and the simple predicate is shown in green.
From the last three examples sentences above you will notice that the simple subjects and simple predicates can be more than one word. |
Advice: To write strong, clear sentences you must know who or what you are writing about (subject) and what you want to say about them or it (predicate). Your writing will be more interesting if the subject is not the first thing in every sentence you write. |
Sentence types: One way to categorize sentences is by the clauses they contain. (A clause is a part of a sentence containing a subject and a predicate.) Here are the 4 sentence types:
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Note: A dependent clause standing alone without an independent clause is called a fragment sentence - see below. |
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Advice: Writing that contains mostly short, simple sentences can be uninteresting or even irritating to read. Writing that consists of mostly long, complex sentences is usually difficult to read. Good writers, therefore, use a variety of sentence types. They also occasionally start complex (or compound-complex) sentences with the dependent clause and not the independent clause. In the following examples the dependent clause is shown:
Note: Sentences can also be categorized according to their function. |
Note: Independent clauses are also called main clauses. Dependent clauses are also called subordinate clauses.
Problematic 'sentences': To write a correct sentence, you need to have a good understanding of what a sentence is. Students who don't have this understanding, or don't take care, often include problem sentences in their writing. Native English speakers are just as likely to write problem sentences as ESL students. There are three main types of problem sentence:
Advice: It is helpful to read your written work aloud. When you speak, you will make natural pauses to mark the end of your sentences or clauses. If there is no corresponding end punctuation mark in your writing, you can be almost certain that you have written a run-on sentence. |
Advice: If your 'sentence' is a dependent clause, or it doesn't contain both a subject and a predicate, then it is not a proper sentence. You can often detect fragments if you read your writing backwards sentence by sentence, i.e. from the last sentence to the first one. You can usually correct a fragment by connecting it to the sentence before or after it. |
Advice: A rambling sentence is quite easy to spot. You have almost certainly written one if your sentence contains more than 3 or 4 conjunctions. If you read the sentence aloud and run out of breath before reaching the end of it, you have written a rambling sentence. If your sentence stretches over many lines of writing, you have certainly written a rambling sentence and most probably a run-on sentence too.
Unlike run-ons or fragments, rambling sentences are not wrong, but they are tiresome for the reader and one of the signs of a poor writer. You should avoid them.
General advice: If you are not sure whether you have written a good, correct sentence, ask your teacher! And remember: The more you read in English, the better a writer you will become. This is because reading good writing provides you with models of English sentence structure that will have a positive influence on your own written work.
Note: Good writing consists not only of a string of varied, correctly-structured sentences. The sentences must also lead from one to the next so that the text is cohesive and the writer's ideas are coherent. For information on these two important concepts, go to the Language words for non-language teachers page and click on Cohesion.
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