IT MUST HAVE BEEN LOVE

It must have been love
When you came here
Dust to dust from above
Sunshine moods in air
All what life is for
Star shines on going
Live on for evermore
In all its timeless glowing
[…]

It must have been dreams
Coming now to its end
[...]

QUINN, Peter. Disponível em: <http://www.poemhunter.com/poem/it-must-have-been-love/>. Acesso em: 16 nov. 2015.

A função do auxiliar “must” na letra é de