I'm still learning Part of Speech and some tenses, but in the basic, I got confused. Like this, "I work" and "I am Work" Why is the one using "am" and the other one is not using "am". Another example is "She studies computer science" why the sentence is not using "is" which matches with "she" (She is studies). When to use the to-be verb and when to not using the to-be verb?
I think your question is about the two tenses present simple and present continuous.