can class
Verbo regular: class - classed- classed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can class
you can class
he can class
we can class
you can class
they can class 	I can be classing
you can be classing
he can be classing
we can be classing
you can be classing
they can be classing	I can have classed
you can have classed
he can have classed
we can have classed
you can have classed
they can have classed	I can have been classing
you can have been classing
he can have been classing
we can have been classing
you can have been classing
they can have been classing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot class
you cannot class
he cannot class
we cannot class
you cannot class
they cannot class 	I cannot be classing
you cannot be classing
he cannot be classing
we cannot be classing
you cannot be classing
they cannot be classing	I cannot have classed
you cannot have classed
he cannot have classed
we cannot have classed
you cannot have classed
they cannot have classed	I cannot have been classing
you cannot have been classing
he cannot have been classing
we cannot have been classing
you cannot have been classing
they cannot have been classing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I class?
can you class?
can he class?
can we class?
can you class?
can they class? 	can I be classing?
can you be classing?
can he be classing?
can we be classing?
can you be classing?
can they be classing? 	can I have classed?
can you have classed?
can he have classed?
can we have classed?
can you have classed?
can they have classed? 	can I have been classing?
can you have been classing?
can he have been classing?
can we have been classing?
can you have been classing?
can they have been classing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not class?
can you not class?
can he not class?
can we not class?
can you not class?
can they not class? 	can I not be classing?
can you not be classing?
can he not be classing?
can we not be classing?
can you not be classing?
can they not be classing? 	can I not have classed?
can you not have classed?
can he not have classed?
can we not have classed?
can you not have classed?
can they not have classed? 	can I not have been classing?
can you not have been classing?
can he not have been classing?
can we not have been classing?
can you not have been classing?
can they not have been classing?