The main use for the present simple is to talk about facts that are always true or things that happen regularly. Water boils at 100 degrees. My sister's a musician. She plays the violin. This is different from the present continuous, which is used for temporary situations and things that are happening right now: The water's boiling - I'll put the pasta in. What's that sound? It's my sister. She's playing the violin.

Hey , how are u ? the simple present , like a habit and fact I go to work by car every day she plays tennis every week they usually use their phone at work . he she + S it they I + without S we

This website will help! http://www.englishpage.com/verbpage/simplepresent.html

yes, i can explain... you need a good grammar book which calls "simple present" as "present indefinite"