FORM of Present Simple
| S + V-s/es | I learn English. He swims well. They watch TV. |
 S + do/does not+ V | I don't learn English. He doesn't swim well. They don't watch TV. |
 Do/Does + S + V? | Do you learn English? Does he swim well? Do they watch TV? |
The simple present expresses an action in the present taking place once, never, always or several times. It is also used for actions that take place one after another and for actions that are set by a timetable or schedule. The simple present also expresses facts in the present.
Source : http://learnenglish.vn/index.php/grammar/verb-tenses/41-verb-tenses/156-present-simple
