In understanding the central idea or the main idea of a particular passage. You must take out the hard terms and look for their meanings. It is one way of understanding at the same time learning with the passage. It is also advisable to stay focus on what you are reading to easily understand it.
Answer:
The grapes are ready to be harvested?
Explanation:
having a backpack and books and going into a class?
Situational irony because it's the situation.
Try this pdf.
It's quite easy to understand and to formulate your opinion on the subject.
Hope it helps and good luck!