To answer the question "If you (be) lost in town, what would you do?", we need to focus on the structure of the conditional sentence and the correct form of the verb "to be". This is a second conditional sentence, which is used to talk about hypothetical situations.

Here’s how we can break it down:

1. Identify the condition: The phrase "If you (be) lost in town" indicates a hypothetical situation where you are lost.
2. Choose the correct verb form: In the second conditional, we use the past simple form of the verb "to be". The correct form is "were". So, the sentence becomes "If you were lost in town".
3. Complete the sentence: After establishing the condition, we need to express the result of that condition. We typically use "would" followed by the base form of the verb. For example, "I would ask for directions" or "I would find a map".

Putting it all together, we can create a complete response. Here are a few examples:

• If you were lost in town, you would ask someone for help.
• If you were lost in town, you would look for a map or a sign.
• If you were lost in town, you would try to remember the name of the street or place you were looking for.

In summary, the correct way to phrase the initial question is: "If you were lost in town, what would you do?" and you can respond with various actions you might take in that situation.