If you had written down his phone number, you ______ searching him for hours in social networks.had not beenwill not bewould not have beenwould not be

To choose the correct option for the sentence, we need to analyze the conditional structure. The sentence implies a hypothetical situation in the past that did not happen, as you did not write down his phone number and, therefore, spent hours searching for him on social networks.

Identifying the Correct Option

1. Understanding the Context:

   • The statement refers to a past action (not writing down the phone number) which affected the present situation (searching for him for hours).

2. Evaluating Options:

   • had not been: This option implies a past perfect structure, but it doesn't fit the conditionality implied in this context.
   • will not be: This option is in the future tense, which is not suitable for this past context.
   • would not have been: This uses past conditional, indicating that if a certain condition had been met in the past (writing down the number), then the result (searching) would not have happened.
   • would not be: This is present conditional, unsuitable for the past scenario.

Final Answer

The correct answer is would not have been.

Thus, the complete sentence reads: "If you had written down his phone number, you would not have been searching him for hours in social networks."