Final answer:
The correct form of the verb to use in the sentence is 'seen'. When using 'have' in combination with a verb, the past participle form of the verb is used to indicate an action that will be completed in the future.
Step-by-step explanation:
The correct form of the verb to use in the sentence 'After tonight I will have Finding Nemo four times' is seen.
The verb 'have' is used in combination with the past participle form of a verb to indicate an action that will be completed in the future. In this case, the action of watching 'Finding Nemo' has not yet occurred, but will be completed before tonight. Therefore, the past participle form 'seen' should be used.
Learn more about Using past tense and past participle verbs in English