A thesis statement along with a topic sentence gives the reader an understanding of what the writer is going to talk about. A thesis statement generally appears as the last sentence in your introduction so the reader can comprehend what the writer is addressing in his essay. Meanwhile, the topic sentence is the first sentence of a paragraph. It should also tell the reader what the paragraph is about and it should connect back to the thesis statement. A block pattern uses its body paragraphs to talk about the same topics about two different subjects. While point-by-point uses its body paragraphs to compare and contrast one topic about the two subjects at one time. The block pattern is good if you want to show the reader the positives in bulk