q Show habitual or regular action.
q State a general truths, facts and scientific laws.
q To indicate future action.
q Show permanent situations.
q To give instructions or orders.
Examples :
· I play tennis.
· She does not play tennis.
· Does he play tennis?
· The train leaves every morning at 8 AM.
· The train does not leave at 9 AM.
· When does the train usually leave?
· She always forgets her purse.
· He never forgets his wallet.
· Every twelve months, the Earth circles the Sun.
· Does the Sun circle the Earth?
For better understanding, refer to this link.
http://www.englishclub.com/grammar/verb-tenses_present.htm
PRESENT TENSE CONTINOUS
We use the Present Continuous Tense to talk about activities happening now.
Examples
· The kids are watching TV.
· I am sitting down, because I am tired.
· I am not learning German, because this is an English class.
· Who are you writing to?
We can also use the Present Continuous Tense to talk about activities happening around now, and not necessarily this very moment.
Examples
· Sally is studying really hard for her exams this week.
· I am reading a really interesting book now.
· How are you brushing up on your English for the trip?
· We aren't working hard these days.
The Present Continuous Tense is also used to talk about activities happening in the near future, especially for planned future events.
Examples
· I am seeing my dentist on Wednesday.
· Polly is coming for dinner tomorrow.
· Are you doing anything tonight?
· We aren't going on holiday next week.
http://www.eclecticenglish.com/grammar/PresentContinuous1A.html
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