Is it okay to use the present form "say" and "have" in this situation?
Yes, it is fine to use the present form ("say" and "have") in this sentence. The speaker is suggesting a hypothetical situation, which can be expressed using the present verb tense ("were" is used earlier in the sentence). Ex: What would you do if I were to bring home a puppy right now? Ex: What would happen to the wedding if it were to rain suddenly?
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