Answer:
In English, our sentences usually operate using a similar pattern: subject, verb, then object. The nice part about this type of structure is that it lets your reader easily know who is doing the action and what the outcome of the action is. A subject performs the action in a sentence
The main idea of this poem is that the world is going to end, it could be because of ice or fire.
The purpose of this poem, is to make you think. I personal think that this poem was make to make you think how the world would end.
Sorry if I get any of them wrong,
6 would be the second one
7 would be the last one
8 would be the third one
9 would say the second one