Question

I _________ (not buy) that telephone. It's expensive.​

Answer 1

Cannot buy, o también puede ser can’t buy.
Espero haberte ayudado.

Answer 2

Respuesta:

I won't  buy that telephone. It's expensive.​

I don't  buy that telephone. It's expensive.​

I didn't buy that telephone. It's expensive.​

Explicación:

Solo necesitas resolverlo con el tiempo de la oracióntr que te dan puede ser (presente, pasado y futuro) :)

You must do it with the time of prayer, it can be (present, past and future) :)