PRESENT PERFECT	Pp+ have//has+ past participle verb	Pp+ have// has+ not + past participle verb		Have// has + pp +past participle verb?		PAST PERFECT	Pp+ HAD+ past participle verb	Pp+ HAD+ not + past participle verb	HAD+ pp +past participle verb?
PP	POSITIVE        +	NEGATIVE        -		INTERROGATIVE   ?		PP	POSITIVE     +	NEGATIVE      -	INTERROGATIVE   ?
EXAMPLE	I have studied	I haven´t studied		Had I studied?		EXAMPLE	I had studied	I hadn´t studied	Had  I studied?
I						I
YOU						YOU
HE						HE
SHE						SHE
IT						IT
WE						WE
YOU						YOU
THEY						THEY
I						I
YOU						YOU
HE						HE
SHE						SHE
IT						IT
WE						WE
YOU						YOU
THEY						THEY
I						I
YOU						YOU
HE						HE
SHE						SHE
IT						IT
WE						WE
YOU						YOU
THEY						THEY
I						I
YOU						YOU
HE						HE
SHE						SHE
IT						IT
WE						WE
YOU						YOU
THEY						THEY