1. Direct speech uses quotation marks to report the exact words spoken, while indirect speech reports the general idea without quotation marks by using verbs like say, ask, or tell. 2. Indirect speech changes verbs to past tense and changes pronouns and determiners. It does not change the tense if the statement is still true. 3. Indirect speech uses verbs like order, tell, and warn to report orders, instructions, or warnings rather than just say. It can also use constructions like "to verb" or "not to verb".