Final answer:
The verb mood in the sentence 'If I was on vacation, I’d play at the beach all day' is the conditional mood, as it presents a hypothetical situation and its consequence.
Step-by-step explanation:
The mood of the verb in the sentence "If I was on vacation, I’d play at the beach all day" is the conditional mood. This mood is used to express what would happen under certain circumstances. The sentence presents a condition that is not currently true (being on vacation), followed by the outcome of that condition being met (playing at the beach all day). As a reference, the indicative mood states facts or asks questions, the imperative mood gives commands, and the subjunctive mood is used for wishes, suggestions, or hypothetical situations. While the subjunctive is often related to hypotheticals, its structure typically involves the use of 'was' instead of 'was' as in, "If I were on vacation..." Therefore, the use of 'was' here points toward a conditional mood rather than a subjunctive mood.