* What is the differece between the language of poetry and the language of prose according to Wordsworth?
He says that the language of poetry is the same as the language of prose. They can be about the same themes, the same topics, the same aim, both are exactly the same. The only difference in poetry is the way the words are arranged. The use of words, figures of speech is the same. But in poetry, the arrangement of words in the line makes the difference.
This is the difference between poetry and prose.
Prose can be poetic. So, he prefers to call poetry metrical arrangement.
He starts by saying that these are experiments that they are fitting to metrical arrangement. He is using language, words, emotions that are fit for metrical arrangement, that are suitable to be used in poetry.

* How is he presenting this? What is the language he uses?
In a selection of the real language of men. The poet cannot use all kinds of words, but he has to select, to choose.
What kind of language? It is the real language of men. It is not the sophisticated language of the educated people.
One difference between the Neo-classical and the Romantics is the use of language. The neo-classical poetry made use of sophisticated language which can only be understood by the educated people.
Wordsworth is using an opposite kind of language, another completely different language which is the language used by everyday speech, the language used by the common people, the everyday speech in a state of vivid sensation

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