The "I DO" learning curve

Stage 1:
Mommy: Who wants to go to the store?
Ellie: I do!
Addie: (smiling and going along)

Stage 2:
Mommy: Who wants to play a game?
Ellie: I do!
Addie: I do!

Stage 3:
Mommy: Do you want to help pick up this mess?
Addie: No!
Ellie: Who wants to help pick up this mess?
Addie: I do!

Stage 4:
Mommy: Let's go to school now.
Addie: No.
Ellie: Who wants to go to...
Addie: (looking very stern) NO!!!