Present Perfect Tense (Simple sentences)
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examples
Subject
Has- Singular
Have-Plural/I
Verb-3rdform
Objects
He has worked.
I have worked.
It has worked.
Jack and Sam have worked.
Present Perfect  Tense (negative sentences)
Subject
Has- Singular
Have-Plural/I
not
Verb-3rdform
Objects
He has not worked.
I have not worked.
It has not worked.
Jack and Sam have not worked.
Present Perfect  Tense (Interrogative sentences)
Has- Singular
Have-Plural/I
Subject
Verb-3rdform
Objects
Has  he worked?
Have  I worked?
Has  it worked?
Have Jack and Sam worked?
Present Tense (Interrogative and negative sentences)
Has- Singular
Have-Plural/I
Subject
not
Verb-3rdform
Objects
Has  he not worked?
Have  I not  worked?
Has  it not  worked?
Have Jack and Sam not worked?
See also  Past Perfect Tense Rule | Perfect Tense Learning