can study
Regular verb: study - studied- studied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can study
you can study
he can study
we can study
you can study
they can study 	I can be studying
you can be studying
he can be studying
we can be studying
you can be studying
they can be studying	I can have studied
you can have studied
he can have studied
we can have studied
you can have studied
they can have studied	I can have been studying
you can have been studying
he can have been studying
we can have been studying
you can have been studying
they can have been studying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot study
you cannot study
he cannot study
we cannot study
you cannot study
they cannot study 	I cannot be studying
you cannot be studying
he cannot be studying
we cannot be studying
you cannot be studying
they cannot be studying	I cannot have studied
you cannot have studied
he cannot have studied
we cannot have studied
you cannot have studied
they cannot have studied	I cannot have been studying
you cannot have been studying
he cannot have been studying
we cannot have been studying
you cannot have been studying
they cannot have been studying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I study?
can you study?
can he study?
can we study?
can you study?
can they study? 	can I be studying?
can you be studying?
can he be studying?
can we be studying?
can you be studying?
can they be studying? 	can I have studied?
can you have studied?
can he have studied?
can we have studied?
can you have studied?
can they have studied? 	can I have been studying?
can you have been studying?
can he have been studying?
can we have been studying?
can you have been studying?
can they have been studying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not study?
can you not study?
can he not study?
can we not study?
can you not study?
can they not study? 	can I not be studying?
can you not be studying?
can he not be studying?
can we not be studying?
can you not be studying?
can they not be studying? 	can I not have studied?
can you not have studied?
can he not have studied?
can we not have studied?
can you not have studied?
can they not have studied? 	can I not have been studying?
can you not have been studying?
can he not have been studying?
can we not have been studying?
can you not have been studying?
can they not have been studying?