There are a lot of essential questions to ask, some examples include "Is this a symbol", "Where have I seen this before?", and "What does the setting have to do with the characters?". If you wish to know more about this kind of literary analysis I suggest reading Thomas C. Foster's "How to Read Literature Like a Professor".
Answer:
can you explain this and I'll write your essay
The last sentence is correct, because the other ones either had periods in the middle or too many commas in them.
