saber

Question 1

I know how to speak Spanish.

Answer 1

Sé hablar español.

Question 2

I am knowing more and more about Spanish grammar.

Answer 2

Estoy sabiendo más y más sobre la gramática española.

Question 3

I am going to know the answer to that question.

Answer 3

Voy a saber la respuesta a esa pregunta.

Question 4

I knew that you would be successful.

Answer 4

Supe que tendrías éxito.

Question 5

I have known many people who have spoken Spanish fluently.

Answer 5

He sabido de muchas personas que han hablado español con fluidez.