● Source: p 55, A Student's Introduction to English Grammar (2005), by Huddleston and Pullum
Please do NOT rephrase or rewrite the disputed sentences.
Epistemic and deontic meanings are not in general associated with different expressions. Many examples are ambiguous, allowing either kind of interpretation for the modal:
[53] You must be very tactful. [epistemic or deontic]
There is an epistemic interpretation of this [= sentence [53] above]
UNDERwhich
it means I have evidence that ... you're very tactful.
1. What's the antecedent of it ? 2. What's the antecedent of which
?
3. How can an interpretation be UNDER a sentence? I (not the book) capitalised.
4. What would differ, if I rewrote [53] without UNDER and it? (Heed the strikethroughs.)
5. There is an epistemic interpretation of this
UNDERwhich
itmeans ...
= There is an epistemic interpretation of thiswhich
means ...