Simple present:"I speak English"

The simple present is usually formed with the unchanged verb as it is ("I speak", "You speak", etc.) but with an -s or -es added to the end for third person singular ( "She speak")

The simple present is used to express something that you generally believe to be true or to describe an action that is onoing. It can be used to talk about habits, jobs, hobbies or abilities. If I say, "I speak English", I am not saying that I am speaking English right now (even if I am). What I am saying is that I have the ability to speak Enlish, or that speaking English is something that I do at least some of the time.

Lets look at the other examples:

"I drink coffee." ( Meaning: Drinking coffee is something that I do sometimes. I am not necessary doing it right now, but I will probably do it again soon.)

"You run." ( Meaning: You run regularly, probably for exercise and maybe every day.)

Sometimes the simple present is used to say that something happens at a particular time, or in a particular situation:

"She runs in the summer."