TASK DEFINITION: This task is about translating a given Spanish language sentence to English.
PROBLEM: Pero si es verdadero para 2, entonces debe ser verdadero para 3, porque probamos que si es verdadero para k, es verdadero para k+1.

SOLUTION: When it's true for 2, then it must be true for 3, because we have proved it, when it's true for k, it's true for k + 1.

PROBLEM: De un tal Sr. Ding.

SOLUTION: - A certain Mr Ding.

PROBLEM: Las dos cosas son posibles si estas dispuesto, No?

SOLUTION:
Both are possible right now if you are willing.