When an enclitic such as -ne or -que is appended to a word does it alter the word's accentuation? M&F's Glossary seems to imply it doesn't ("An enclitic ... loses its own accent").
Does that mean that "optavistis" and "optavistisne?" should both be pronounced with the stress on the third syllable, rather than on what looks like the penult of each? And that "..tisne" acts as one syllable?