Main ideas can be classified into 2 types, namely stated main ideas and implied main ideas. The first type is main ideas which are explicitly stated in a paragraph whereas the second type is main ideas which are not stated and thus must be implied from clues provided in the paragraph. Stated main ideas can be in one or two sentences. They are usually found at the beginning, in the middle or at the end of the paragraph. Examples A, B and C underline the location of the stated main idea of each paragraph. Example D is an illustration of an implied main idea. The underlined words signify the clues that help the reader to identify the main idea.