Lena wrote, 'Could I to borrow the thermal camera?' The subject I stays outside the answer. Enter only the corrected two-word modal-and-verb pair, preserving could and using the exact verb in brackets: ___. (borrow)

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Could borrow is the required two-word correction because a core modal takes the bare verb. Keeping to would leave the phrase ungrammatical, while replacing could would ignore the instruction to preserve the polite-request modal.