Final answer:
The correct form of the verb to complete the sentence 'Do you know the man (talk)______to Tom ?' is 'talking', resulting in the sentence 'Do you know the man talking to Tom?'.
Step-by-step explanation:
To correctly complete the sentence "Do you know the man (talk)______to Tom ?", we need to identify the correct form of the verb in the parentheses. In this case, the sentence requires a present participle because it describes an action that is happening at the same time as the action in the main clause. The present participle form of "talk" is "talking", so the completed sentence is: "Do you know the man talking to Tom?". This structure is commonly used in English to describe an ongoing action related to the subject of the sentence, which is the man speaking with Tom.