Possible Clues:

• Should, informally
• ''You __ Be in Pictures''
• Really must, informally
• "Why I ___ ..."
• Should, so to speak
• 'Why, I ___ ...'
• Alanis Morissette "You ___ Know"
• 'There -- be a law!'
• "You __ Know": Alanis Morissette hit
• ''There __ be a law!''