Question

Exercises:

They know my phone number. Respuesta
They don't know my phone number.
Correcta
We work very hard. Respuesta
We don't work very hard.
Correcta
He has a shower every day. Respuesta
He doesn't has a shower every day.
Incorrecta
I like football. Respuesta
I don't like football.
Correcta
Susan drinks tea every morning.

Answer 1

Si te refieres a corregirlas, pues:

El verbo auxiliar, al utilizarse con la gramática de la 3ra persona (he, she, it), se transforma en doesn't, correcto. Pero, te olvidas de que el verbo queda en su forma normal. (Has = have.)

Entonces, lo correcto sería:

He has a shower every day. --> He doesn't have a shower every day.

Susan drinks tea every morning. --> Susan doesn't drink tea every morning.