Final answer:
The correct form of the irregular verb "get" in the sentence is the present participle "getting."
Step-by-step explanation:
In the sentence "Claude is getting a new computer for his birthday this year," the correct form of the irregular verb "get" is the present participle, which is "getting." The present participle is formed by adding -ing to the base form of the verb. In this case, the base form of "get" is "get," and adding -ing gives us "getting."
Learn more about Irregular verbs