Look at these examples (in pairs, 1 minute)
If we do nothing, over 2 million people will be flooded in coastal areas.
If we do nothing, droughts and water shortages will impact southern regions.
If I study, I will pass the exam.
If it doesn't rain tomorrow, we'll go to the beach.
1. Which part of the sentence expresses the condition?
2. What is the meaning of the second part?