Possible Clues:

• Part of a Spanish 'to be' conjugation
• Toast opening, across the pond
• You are, in Juarez
• ''___ Tu''
• You are, in Aragón
• '___ Tú' (1970s Mocedades hit)
• ''__ Tu'' (1974 tune)
• 'You are' in Spain
• '70s hit song ''___ Tu''
• ''__ Tu'' (1974 song)