Sentence structure: fragments, clauses and clean boundaries

Find each clause core

A clause contains a subject and a finite verb. An independent clause expresses a complete thought; a dependent clause begins with a word such as although, because, when or if and must attach to a main clause.

Length is not the test. A three-word sentence can be complete, while a thirty-word group can remain a fragment if its only clause is dependent.

Use legal boundaries

• Period: separates two complete sentences.
• Semicolon: joins two closely related independent clauses.
• Comma plus coordinating conjunction: joins complete clauses while naming their relationship.
• Comma alone: cannot join two independent clauses.

A reliable editing routine

• Underline every finite verb.
• Find the subject attached to each verb.
• Label each clause independent or dependent.
• Choose punctuation only after the clause labels are clear.

Build controlled variety

Strong writing mixes short direct sentences with controlled compound and complex sentences. Variety should clarify relationships, not display complexity. If a long sentence hides its main point, split it or move the main clause forward.