Possible Clues:

• 'Methinks thou ___ protest too much'
• 'Why ___ thou use me thus?' ('King Lear' quote)
• Verb before "thou," perhaps
• "__ thou know who made thee?": Blake
• Biblical verb with "thou"
• Verb for thou
• 'After whom ___ thou pursue?': 1 Samuel
• '___ thou think so, spirit?': Prospero
• ''___ thou know me, fellow?'' (''King Lear'')
• Word before 'thou'