To get samples of thesis statements, visit university writing center websites. For example, the University of Washington Writing Center and Purdue University Online Writing Lab offer samples and guides to writing thesis statements.
The University of Washington writing center provides concrete examples of good thesis statements and examples of statements that do not qualify. Thesis statements are not statements of fact or opinion. Instead, they must make a claim or argument that can be supported and defended in the paper.
In addition to sample thesis statements, Purdue University Online Writing Lab offers tips for writing thesis statements for analytical, expository and argumentative style papers.