1. Conjugation

Affirmative

Negative

Interrogative

I have worked
You have worked
He has worked
She has worked
It has worked
We have  worked
You have  worked
They have  worked

I have not worked
You have not worked
He has not worked
She has not worked
It has not worked
We have not worked
You have not worked
They have not worked

Have  I worked?
Have you worked?
Has he worked?
Has she worked?
Has it worked?
Have we worked?
Have you worked?
Have they worked?

have + infinitive+ed

have + not + infinitive+ed

have + personal pronoun + inf+ed

Contracted forms:    have = 've           have not = haven't 
                            has = 's               has not = hasn't

2.  Spelling

General rule: infinitive without 'to' + ED
to work --> I have worked

Verbs ending in E or IE: infinitive without 'to' + D
to die --> He has died

Verbs ending in Y, preceded by a consonant: the Y changes into IED
to try --> She has tried

Verbs ending in L, preceded by a short vowel: the L is doubled + ED
to travel --> We have travelled

Verbs ending in IC: the C is followed by K + ED
to panic --> They have panicked

Verbs of one syllable, ending in a single consonant, preceded by a short vowel: 
the end consonant is doubled + ED
to plan --> You have planned