The sentences that correctly express the conditional mood are as follows:
Correct:
- If we had left earlier, we would have arrived on time.
- If the rain had stopped, you could have gone to the park.
Incorrect:
- If Evan had called, we would make plans for later. (This should be "we would have made plans for later.")
- If the flowers are blooming, they would have smelled sweet. (This should be "they smell sweet" or "they would smell sweet" for a hypothetical situation.)
So, the first and third sentences are correct, while the second and fourth sentences are incorrect.