may contribute
Verbo regular: contribute - contributed- contributed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may contribute
you may contribute
he may contribute
we may contribute
you may contribute
they may contribute 	I may be contributing
you may be contributing
he may be contributing
we may be contributing
you may be contributing
they may be contributing	I may have contributed
you may have contributed
he may have contributed
we may have contributed
you may have contributed
they may have contributed	I may have been contributing
you may have been contributing
he may have been contributing
we may have been contributing
you may have been contributing
they may have been contributing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may not contribute
you may not contribute
he may not contribute
we may not contribute
you may not contribute
they may not contribute 	I may not be contributing
you may not be contributing
he may not be contributing
we may not be contributing
you may not be contributing
they may not be contributing	I may not have contributed
you may not have contributed
he may not have contributed
we may not have contributed
you may not have contributed
they may not have contributed	I may not have been contributing
you may not have been contributing
he may not have been contributing
we may not have been contributing
you may not have been contributing
they may not have been contributing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I contribute?
may you contribute?
may he contribute?
may we contribute?
may you contribute?
may they contribute? 	may I be contributing?
may you be contributing?
may he be contributing?
may we be contributing?
may you be contributing?
may they be contributing? 	may I have contributed?
may you have contributed?
may he have contributed?
may we have contributed?
may you have contributed?
may they have contributed? 	may I have been contributing?
may you have been contributing?
may he have been contributing?
may we have been contributing?
may you have been contributing?
may they have been contributing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I not contribute?
may you not contribute?
may he not contribute?
may we not contribute?
may you not contribute?
may they not contribute? 	may I not be contributing?
may you not be contributing?
may he not be contributing?
may we not be contributing?
may you not be contributing?
may they not be contributing? 	may I not have contributed?
may you not have contributed?
may he not have contributed?
may we not have contributed?
may you not have contributed?
may they not have contributed? 	may I not have been contributing?
may you not have been contributing?
may he not have been contributing?
may we not have been contributing?
may you not have been contributing?
may they not have been contributing?