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present simple
 
The present tense is the base form of the verb: I work in London. 
But the third person (she/he/it) adds an -s: She works in London.
Use
We use the present tense to talk about:
* something that is true in the present:
I’m nineteen years old.
He lives in London.
I’m a student.
* something that happens again and again in the present:
I play football every weekend.We use words like sometimes, often. always, and never (adverbs of frequency) with the present tense:
I sometimes go to the cinema.
She never plays football.
* something that is always true:
The human body contains 206 bones.
Light travels at almost 300,000 kilometres per second.
  
* something that is fixed in the future.
The school terms starts next week.
The train leaves at1945 this evening.
We fly to Paris next week.
 
Questions and negatives
Look at these questions:
Do you play the piano?
Where do you live?
Does Jack play football?
Where does he come from?
Do Rita and Angela live in Manchester?
Where do they work?
* With the present tense, we use do and does to make questions. We use does for the third person (she/he/it) and we use do for the others. 
 We use do and does with question words like where, what and why:
 
 But look at these questions with who:
Who lives in London?
Who plays football at the weekend?
Who works at Liverpool City Hospital?
Look at these sentences:
I like tennis, but I don’t like football. (don’t = do not)
I don’t live in London now.
I don’t play the piano, but I play the guitar.
They don’t work at theweekend.
John doesn’t live in Manchester. (doesn’t = does not)
Angela doesn’t drive to work. She goes by bus.
* With the present tense we use do and does to make negatives. We use does not (doesn’t) for the third person (she/he/it) and we use do not (don’t) for the others.
Complete these sentences with don’t or doesn’t:

present continuous
 
The present continuous tense is formed from thepresent tense of the verb be and the present participle (-ing form) of a verb:
Use
1. We use the present continuous tense to talk about the present:
* for something that is happening at the moment of speaking:
I’m just leaving work. I’ll be home in an hour.
Please be quiet. The children are sleeping.
* for something which is happening before and after a given time:
At eight o’clockwe are usually having breakfast.
When I get home the children are doing their homework.
 
* for something which we think is temporary:
Michael is at university. He’s studying history.
I’m working in London for the next two weeks.
* for something which is new and contrasts with a previous state:
These days most people are using email instead of writing letters.
What sort ofclothes are teenagers wearing nowadays? What sort of music are they listening to?
* to show that something is changing, growing or developing:
The children are growing quickly.
The climate is changing rapidly.
Your English is improving.
* for something which happens again and again:
It’s always raining in London.
They are always arguing.
George is great. He’s always laughing.
Note: Wenormally use always with this use.
2. We use the present continuous tense to talk about the future:
* for something which has been arranged or planned:
Mary is going to a new school next term.
What are you doing next week?
3. We can use the present continuous to talk about the past:
* When we are telling a story: 
* When we are summarising the story from a book, film or play etc.:present perfect
 
The present perfect is formed from the present tense of the verb have and the past participle of a verb:
The present perfect continuous is formed with have/has been and the -ing form of the verb:
Use
We use the present perfect tense:
* for something that started in the past and continues in the present:
They’ve been married for nearly fifty years.
She has lived in...