In macbeth, the witches have a particular style of speech. how many words can you give to describe it? why do you think shakespeare made them talk like that?

Generally, the witches speak in a trochaic rhythm (sets of two syllables that alternate stressed then unstressed -- the opposite of iambic), with shorter lines of 8 syllables rather than 10 syllables. This sets them apart from the traditional characters, because their speech rhythm is different so it makes them seem more mystical and magical. 

There are no options for me to pick

The answer to your question is what