HAVE / HAS and HAD

   Like the Verb To be, The verb HAVE can be use as a main verb or an auxiliary verb. Now we will see how we can use it and which are it changes

I,you, we and they use HAVE, but in HE,She and IT we must to use HAS, if we are talking or writing in present. If we use the past tense have/has changes to HAD. 

Ex. 

1. I Have a bike 
2. 
   
3. You have a bike 
4. 
   
5. He has a bike 
6. 
   
7. She has a bike 
8. 
   
9. It has a bike 
10. 
    
11. We have a bike 
12. 
    
13. They have a bike. 

Like the verb to be, Have  has a negative form,too : 

•   Have not 
•   Has not 

And it has a contracted form:

•   Haven't
•   hasn't