Look for a sentence that forms a complete thought and contains a verb and subject. "He ran down the street" is an independent clause. An independent clause must not include dependent marker words like "if," "after," "although," "because" and "when."
Read through a sentence in search of words like "as," "because," "until" and similar types of adverbs. "Until the sun went down" is an example of a dependent clause. Note that it does not form a complete thought; instead, it relies on another clause to complete the sentence. Combined with the independent clause from Step 1, it becomes: "He ran down the street until the sun went down."
Search for sentences that contain words like "after" or "once." These words help form subordinate, or adverb, clauses. "Once Tommy got home" is an example of a subordinate clause. Subordinate clauses answer questions about the independent clause. For example: "Once Tommy got home, he ran down the street." However, they are a type of dependent clause, so alone, they do not form a complete sentence.
Find the part of a sentence that begins with words like "that" or "where." An adjective clause example is, "where Tommy ran." Used in a sentence, it becomes: "This is the street where Tommy ran." The adjective clause modifies the noun or pronoun that proceeded it and also cannot stand alone.
Identify the part of the sentence that functions as a noun, and you'll find a noun clause. A noun clause stands in for the noun: "What Tommy did" forms a noun clause. Used in a sentence, it becomes: "What Tommy did shocked his friends."
Look for a sentence that clearly contains missing or implied words and events. "Tommy can run faster than his sister" is an example of a sentence containing an elliptical clause. The elliptical clause is "than his sister." The original sentence before using the elliptical clause is: "Tommy can run faster than his sister can run."