The document discusses different connectors used to indicate reason, purpose, contrast and contradiction in sentences. It provides examples of using reason connectors like "as", "because" or "since" followed by a clause to indicate why something occurred. Purpose connectors like "so that", "in order to" or "to" can be followed by a clause or infinitive to indicate intention. Contrast connectors like "despite", "in spite of" or "though" can be used followed by a noun, -ing form or "the fact that" to show something occurred even when opposing circumstances existed. A contrast but not contradiction connector like "while" or "whereas" can connect two clauses with opposing ideas.