can contend
Verbo regular: contend - contended- contended

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can contend
you can contend
she can contend
we can contend
you can contend
they can contend 	I can be contending
you can be contending
she can be contending
we can be contending
you can be contending
they can be contending	I can have contended
you can have contended
she can have contended
we can have contended
you can have contended
they can have contended	I can have been contending
you can have been contending
she can have been contending
we can have been contending
you can have been contending
they can have been contending	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot contend
you cannot contend
she cannot contend
we cannot contend
you cannot contend
they cannot contend 	I cannot be contending
you cannot be contending
she cannot be contending
we cannot be contending
you cannot be contending
they cannot be contending	I cannot have contended
you cannot have contended
she cannot have contended
we cannot have contended
you cannot have contended
they cannot have contended	I cannot have been contending
you cannot have been contending
she cannot have been contending
we cannot have been contending
you cannot have been contending
they cannot have been contending	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I contend?
can you contend?
can she contend?
can we contend?
can you contend?
can they contend? 	can I be contending?
can you be contending?
can she be contending?
can we be contending?
can you be contending?
can they be contending? 	can I have contended?
can you have contended?
can she have contended?
can we have contended?
can you have contended?
can they have contended? 	can I have been contending?
can you have been contending?
can she have been contending?
can we have been contending?
can you have been contending?
can they have been contending? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not contend?
can you not contend?
can she not contend?
can we not contend?
can you not contend?
can they not contend? 	can I not be contending?
can you not be contending?
can she not be contending?
can we not be contending?
can you not be contending?
can they not be contending? 	can I not have contended?
can you not have contended?
can she not have contended?
can we not have contended?
can you not have contended?
can they not have contended? 	can I not have been contending?
can you not have been contending?
can she not have been contending?
can we not have been contending?
can you not have been contending?
can they not have been contending?