Read and analyze the following sentences, then answer the questions that follow.
1. If you heat water to 100 degrees, it boils.
2. If it rains tomorrow, we will not go to the cinema.
3. If I had a lot money, I would travel the world.
4. If I had gone to bed early, I would have caught the train.
What appears to be common for all the four sentences? Give at least two
classification using the box below.​