Here are some possible paragraph patterns:

Pattern A:
First sentence: Main idea
Next sentence(s): Further explanation of the main idea.
Next sentence(s): Examples or evidence or both.
Final sentence of the paragraph: A summary idea of the main concepts of the paragraph or a lead-in to the continued development of the main idea in the following paragraph.

Pattern B:
Paragraph starts with examples/evidence and concludes with a main idea statement.

Pattern C:
Paragraph consists of examples and evidence as a follow-up to the preceding paragraph's main idea statement.

Pattern D:
Paragraph provides explanations, examples, evidence, comparisons and contrasts, but the main idea is implied; it is not stated clearly in any one sentence of the paragraph. This means the reader needs to determine the main idea and should make note of it in the margin.