May you hear from your sister soon. Is this correct English?

The sentence "May hear from your sister soon" is grammatically correct but it lacks a subject. To make it a complete sentence, you need to add a subject.

Here are some ways to correct it:

* "May you hear from your sister soon." (This is a polite wish)

* "I hope you hear from your sister soon." (This expresses a hope)

* "She may hear from her sister soon." (This implies that someone else may hear from the sister)

The correct choice depends on the context and the meaning you want to convey.