Possible Clues:

• Are able to, Biblically
• Is able to, biblically
• Is allowed to, quaintly
• Art able to take part in American state
• "Thou __ not then be false to any man": "Hamlet"
• "Doubt 'til thou __ doubt no more ...": Guerard
• 'What services ___ thou do?': Lear
• 'Bold Lover, never, never ___ thou kiss': Keats
• Art able
• Is able to, Shakespearean-style