General Principles of Intellectual Property: Concepts of Intellectual Proper...
Present Perfect
1. The structure is:
I- you- we- they + HAVE + P. Participle
He- she- it + HAS + P. Participle
2. Subject Afirmative Negative Question
• I-You- • I have • I haven’t • Have I
We-They spoken spoken spoken?
• He-She- • She has • She • Has she
It spoken hasn’t spoken?
spoken