PROSE: spoken or written language as in ordinary usage, distinguished from poetry by its lack of a marked metrical structure
METER: the arrangement of words in poetic rhymes, it is a pattern made up of stressed and unstressed syllables
FOOT: a group of syllables that forms one complete unit of a metrical pattern
IAMBIC PENTAMETER: is a line with ten beats; it is made up of five foot (unstressed/stressed syllables)
BLANK VERSE is anun-ryhiming verse written in iambic pentameter
ASIDE: something spoken by an actor to or for the audience and supposedly not heard by others on stage
MONOLOGUE: a dramatic piece spoken by a single performer
SOLILOQUY: a speech in a drama in which a character, alone or as if alone, reveals innermost thoughts
ALLUSION: a passing or casual reference to something, either directly or implied
FOIL: a character whose personality or attitudes are in sharp contrast to those of another character in the same work
TRAGEDY: a play in which the protagonist, usually a man of importance and outstanding personal qualities, falls to disaster through the combination of a personal failing and circumstances with which he cannot deal

> Iago switches between speaking in verse and speaking in prose, indeed he speakes using a poetical lenguage when he dialogue with relevant characters (for example Othello), when he has to outline deceits or in soliloquies; while he uses a prose speech when he talks to himself or when he dialogues with characters he thinks he/she is inferior (such as Cassio, Bianca..)

> Reading Iago's first cue, the reader is captured by his speaking skills; first of all the reader notices that the character's speech is written in lines: in the reader's mind, this choice creates the idea of a skilfull and intelligent character.

Going on reading the reader's conjecture is confirmed, but since he finds words full of hate and jealousy he may also conjecture that Iago may use his skills for evil porpouses. Indeed Iago is angry with his general because he had chosen Michael Cassio as his liutenant insted of him, so Iago connotes his general as a man who loves only 'his own pride and purpouse' and Cassio as an incompetent who doesn't know 'more than a spinster' about the division of a battle.

So the retorical skills of the character (who can also focus the reader's attention on specific passages leaving irrelevant details - 'and in coclusion'- and using rethorical devices -'and I..' 'and I..') gain a negative connotation, since they are associated to presumption and jealousy.