How do the poetic forms of brutus’ and mark antony’s speeches reflect their characters? brutus’ speech is written in prose, which is used to show rational thought. mark antony’s speech uses blank verse, which matches his passion and emotion. brutus’ speech is written in blank verse, which is used to show rational thought. mark antony’s speech uses blank verse, which matches his passion and emotion. brutus’ speech is written in blank verse, which is used to show rational thought. mark antony’s speech uses prose, which matches his passion and emotion. brutus’ speech is written in iambic pentameter, which is used to show rational thought. mark antony’s speech uses prose, which matches his passion and emotion.