can contract
Verbo regular: contract - contracted- contracted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can contract
you can contract
he can contract
we can contract
you can contract
they can contract 	I can be contracting
you can be contracting
he can be contracting
we can be contracting
you can be contracting
they can be contracting	I can have contracted
you can have contracted
he can have contracted
we can have contracted
you can have contracted
they can have contracted	I can have been contracting
you can have been contracting
he can have been contracting
we can have been contracting
you can have been contracting
they can have been contracting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot contract
you cannot contract
he cannot contract
we cannot contract
you cannot contract
they cannot contract 	I cannot be contracting
you cannot be contracting
he cannot be contracting
we cannot be contracting
you cannot be contracting
they cannot be contracting	I cannot have contracted
you cannot have contracted
he cannot have contracted
we cannot have contracted
you cannot have contracted
they cannot have contracted	I cannot have been contracting
you cannot have been contracting
he cannot have been contracting
we cannot have been contracting
you cannot have been contracting
they cannot have been contracting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I contract?
can you contract?
can he contract?
can we contract?
can you contract?
can they contract? 	can I be contracting?
can you be contracting?
can he be contracting?
can we be contracting?
can you be contracting?
can they be contracting? 	can I have contracted?
can you have contracted?
can he have contracted?
can we have contracted?
can you have contracted?
can they have contracted? 	can I have been contracting?
can you have been contracting?
can he have been contracting?
can we have been contracting?
can you have been contracting?
can they have been contracting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not contract?
can you not contract?
can he not contract?
can we not contract?
can you not contract?
can they not contract? 	can I not be contracting?
can you not be contracting?
can he not be contracting?
can we not be contracting?
can you not be contracting?
can they not be contracting? 	can I not have contracted?
can you not have contracted?
can he not have contracted?
can we not have contracted?
can you not have contracted?
can they not have contracted? 	can I not have been contracting?
can you not have been contracting?
can he not have been contracting?
can we not have been contracting?
can you not have been contracting?
can they not have been contracting?