Prostý	Průběhový
Přítomný
	I ask             he asks
I don´t ask    he doesn´t ask
Do I ask?      Does he ask? 
	I´m asking        heis askin
I´m not asking  he ins´t asking
Am I asking?      is he asking?
Přít. tvar be
Minulý
	I asked   
I didn´t ask
Did I asked?
u nepravidelných sloves 2.tvar	I was asking      you were asking
I wasn´t asking  you weren´t asking
Was I asking?    were you asking? 
Min. tvar be + -ing
Předpřít.
	I have asked
I haven´t asked
Have I asked?
have + min. příčestí(3.tvar) 	I have been asking       
I haven´t been asking  
Have I been asking?
have + been + -ing 
Maturita.cz - referát (verze pro snadný tisk)
http://www.maturita.cz/referaty/referat.asp?id=3899