Objetivo
Reconocer y usar contracciones afirmativas y negativas de to be.
El español no usa apóstrofos equivalentes; hay que asociar cada sonido reducido con su forma completa y su sujeto.
Regla central
I am → I'm; he/she/it is → he's/she's/it's; you/we/they are → you're/we're/they're; is not → isn't; are not → aren't.