In English, there are five different types of finite clauses:
declarative, interrogative, imperative, exclamative, and optative
Here are examples:
(1) You are generous. [declarative]
(2) Are you generous? How generous are you? [interrogative]
(3) How generous you are! [exclamative]
(4) Be generous. [imperative]
(5) May you be generous. [optative]
I know that an imperative clause cannot be used as a subordinate clause, and that a declarative, interrogative, and exclamative can.
What about 'optative'? Can an optative clause ever be used as a subordinate clause?
For example, how can you change this into reported speech?
I said, "May you be generous."