How many countries speak Portuguese ?
A total of 8 countries. The Portuguese is the fifth most used language in the world.
Is the gender something natural ?
No, it is not. The gender is socially and collectively built along history, and its specifications may vary in accord with each society and culture.
What is the main verb that you need to know in order to well communicate in English
The main verb in English is the verb to be. About 70% of the sentences that ESL students first learn came from the verb to be.