Answer:
If there [is] too much garbage, the air will be seriously polluted.
What a pity[,] I have to look at my little brother, so I can't go to the cinema tonight.
Explanation:
Any sentence with if at the beginning is usually present tense.
Commas always go after "What a pity".
I also did not see periods at the end of both sentences.
Answer: Personification
Explanation: She's telling that id doesn't last long but is still beautiful just like our lives.
Answer: It means that there is no need to mention the subject until it is closer or becomes important.
They could use the setting to build up tension by having the setting around the main character's dangerous?