AFFIRMATIVE (+) 
FORMULA
+ / - / ?
have / has + V3
  
FORM
S
have / has 
V3
I have worked
We have worked
You have worked
They have worked
He has worked
She has worked
It has worked

Short forms: 
have = 've
I have worked = I've worked
 
has = 's
She has worked = She's worked 
NOTE!
" 's " may be used in different situations:
 
1. 's V3 = has V3 — Present Perfect
E.g. He's worked. = He has worked.
2. 's Ving = is Ving — Present Continuous
E.g. He's working. = He is working.
3. 's V3 = is V3 — Present Simple Passive
E.g. It's done. = It is done.
4. let's = let us
E.g. Let's go. = Let us go.
NEGATIVE (-)
FORMULA  
+ / - / ?
S + have / has + not + V3
 
FORM
 
S
have/has
not
V3
I have not worked
We have not worked
You have not worked
They have not worked
He has not worked
She has not worked
It has not worked
 
Short forms:
 
have not = haven't
I have not worked. = I haven't worked.
  
has not = hasn't
She has not worked. = She hasn't worked.
 
***
S — Subject of the sentence. E.g. I, we, you, they, he, she, it, Mary, John, my friends, etc.
V3 — Verb in the 3rd form (Past Participle). E.g. written, gone, listened, etc.
Revise irregular verbs here and how to add "ed" to regular verbs here.