Final answer:
The conditional mood is used to express a hypothetical situation or condition that must be met. It is formed using the past perfect tense and the modal verb 'would'.
Step-by-step explanation:
The correct sentences that express the conditional mood are:
- If we had left earlier, we would have arrived on time.
- If the rain had stopped, you could have gone to the park.
The conditional mood is used to express a hypothetical situation or a condition that must be met for something to happen. It is formed using the past perfect tense (had + past participle) followed by the modal verb 'would' and the base form of the main verb.
Learn more about Conditional mood