can stud
Verbo regular: stud - studded- studded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can stud
you can stud
he can stud
we can stud
you can stud
they can stud 	I can be studding
you can be studding
he can be studding
we can be studding
you can be studding
they can be studding	I can have studded
you can have studded
he can have studded
we can have studded
you can have studded
they can have studded	I can have been studding
you can have been studding
he can have been studding
we can have been studding
you can have been studding
they can have been studding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot stud
you cannot stud
he cannot stud
we cannot stud
you cannot stud
they cannot stud 	I cannot be studding
you cannot be studding
he cannot be studding
we cannot be studding
you cannot be studding
they cannot be studding	I cannot have studded
you cannot have studded
he cannot have studded
we cannot have studded
you cannot have studded
they cannot have studded	I cannot have been studding
you cannot have been studding
he cannot have been studding
we cannot have been studding
you cannot have been studding
they cannot have been studding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I stud?
can you stud?
can he stud?
can we stud?
can you stud?
can they stud? 	can I be studding?
can you be studding?
can he be studding?
can we be studding?
can you be studding?
can they be studding? 	can I have studded?
can you have studded?
can he have studded?
can we have studded?
can you have studded?
can they have studded? 	can I have been studding?
can you have been studding?
can he have been studding?
can we have been studding?
can you have been studding?
can they have been studding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not stud?
can you not stud?
can he not stud?
can we not stud?
can you not stud?
can they not stud? 	can I not be studding?
can you not be studding?
can he not be studding?
can we not be studding?
can you not be studding?
can they not be studding? 	can I not have studded?
can you not have studded?
can he not have studded?
can we not have studded?
can you not have studded?
can they not have studded? 	can I not have been studding?
can you not have been studding?
can he not have been studding?
can we not have been studding?
can you not have been studding?
can they not have been studding?