Possible Clues:

• ''Either he goes ___ go!''
• 'Either you do it -- will!'
• '... ___ shall die'
• "... — quit!" (threat ender)
• '... -- quit!' (ultimatum)
• Mouth: Prefix
• 'It must be him, ___ shall die'
• "Either thou, __ ... must go with him": Romeo
• 'Either he goes -- go'
• “Horatio, ___ do forget myself”: Hamlet