How to write Have you done lunch in sanskrit?

There isn't a direct equivalent of "Have you done lunch?" in Sanskrit, as the concept of "lunch" as a specific meal is not inherent in the language.

However, you could convey the meaning using a few different approaches:

1. Asking if someone has eaten:

* किं त्वं भोजनं कृतवान्? (kim tvam bhojanam kritavan?) - This literally means "Have you done food?"

* किं त्वं अद्य भोजनं कृतवान्? (kim tvam adya bhojanam kritavan?) - This means "Have you done food today?"

2. Asking if someone has had lunch:

* किं त्वं मध्याह्न भोजनं कृतवान्? (kim tvam madhyahna bhojanam kritavan?) - This literally means "Have you done midday food?"

* किं त्वं अपराह्णे भोजनं कृतवान्? (kim tvam aparahne bhojanam kritavan?) - This means "Have you done afternoon food?"

3. A more colloquial approach:

* भवतः भोजनं कृतं किं न? (bhavatas bhojanam kritam kim na?) - This literally means "Your food done, yes/no?"

Remember to adjust the gender and number of the pronouns ("tvam" for "you", "bhavatas" for "you") to match the person you're addressing.

These are just a few examples, and the specific wording might depend on the context and the formality of the situation.