What is the past tense of not stay?

Answer 1

The past tense of stay is stayed. It does not change when you use it in the negative by adding the word not. However, in many applications, when you use not, you do not use the simple past tense.

For example, you might say, "I stayed last weekend at Amy's." But in the negative you would say "I did not staylast week at Amy's."

Answer 2

The past tense of "not stay" is "did not stay."