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
he can contend
we can contend
you can contend
they can contend 	I can be contending
you can be contending
he can be contending
we can be contending
you can be contending
they can be contending	I can have contended
you can have contended
he 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
he 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
he cannot contend
we cannot contend
you cannot contend
they cannot contend 	I cannot be contending
you cannot be contending
he cannot be contending
we cannot be contending
you cannot be contending
they cannot be contending	I cannot have contended
you cannot have contended
he 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
he 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 he contend?
can we contend?
can you contend?
can they contend? 	can I be contending?
can you be contending?
can he be contending?
can we be contending?
can you be contending?
can they be contending? 	can I have contended?
can you have contended?
can he 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 he 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 he 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 he 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 he 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 he not have been contending?
can we not have been contending?
can you not have been contending?
can they not have been contending?