8.3 Sentence Structure
When building anything, it is important to be familiar with the tools you are using. Grammatical elements are the main “tools” you use when when building sentences in longer written works. Thus, it is critical to have some understanding of grammatical terminology in order to construct effective sentences.
The two essential parts of a sentence are the subject and the predicate (verb portion). The subject refers to the topic being discussed (or the ‘doer’ or ‘agent’ of the sentence), while the verb conveys the action or state of being expressed in the sentence (what the subject does).
All clauses must contain both a subject and a verb. Phrases, on the other hand, lack one or both a subject and a verb, so they need to relate to or modify other parts of the sentence. Main clauses, also called independent clauses, can stand on their own and convey an idea. Dependent clauses, also called subordinate clauses, rely on another part of the sentence for meaning and can’t stand on their own.
Consider the following example in Table 8.3.1:
Consider the following example in Table 8.3.2:
Being able to identify the critical parts of the sentence will help you design sentences that have a clear and effective subject-verb relationship. Knowing the components will also help you improve your punctuation. If you would like a more detailed review of sentence structure, visit Purdue’s OWL (Online Writing Lab) Mechanics page.
Sentence Structures
There are four main types of sentence structures: simple, compound, complex, and compound-complex. In the examples above, Sentence 1 is a simple sentence, while Sentence 2 is complex.
SIMPLE SENTENCES have one main clause (one subject + one verb) and any number of phrases. The following are all simple sentences:
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- A simple sentence can be very effective.
- It makes one direct point.
- It is good for creating emphasis and clarity.
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COMPOUND SENTENCES have two or more main clauses joined by coordinating conjunctions (CC) such as for, and, nor, but, or, yet, so (FANBOYS). You can also connect them using a semi-colon or a colon. By coordinating the ideas, you give them equal weight and importance [Subject + verb…, CC then subject + verb].
The following sentences are all compound:
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- A compound sentence coordinates two ideas, and each idea is given roughly equal weight.
- The two ideas are closely related, so they should be kept close together.
- The two clauses may express a parallel idea, and they might also have a parallel structure.
- Compound sentences need coordinating conjunctions, or they become comma splices, which are a type of run-on.
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COMPLEX SENTENCES express complex and usually unequal relationships between ideas. One idea is “subordinated” to the main idea by using a “subordinate conjunction” (like while, because, and although); one idea is “dependent” upon the other one for logic and completeness. Complex sentences include one main clause and at least one dependent clause (see Example 2