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
she may contribute
we may contribute
you may contribute
they may contribute 	I may be contributing
you may be contributing
she may be contributing
we may be contributing
you may be contributing
they may be contributing	I may have contributed
you may have contributed
she 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
she 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 mayn't contribute
you mayn't contribute
she mayn't contribute
we mayn't contribute
you mayn't contribute
they mayn't contribute 	I mayn't be contributing
you mayn't be contributing
she mayn't be contributing
we mayn't be contributing
you mayn't be contributing
they mayn't be contributing	I mayn't have contributed
you mayn't have contributed
she mayn't have contributed
we mayn't have contributed
you mayn't have contributed
they mayn't have contributed	I mayn't have been contributing
you mayn't have been contributing
she mayn't have been contributing
we mayn't have been contributing
you mayn't have been contributing
they mayn't have been contributing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I contribute?
may you contribute?
may she contribute?
may we contribute?
may you contribute?
may they contribute? 	may I be contributing?
may you be contributing?
may she be contributing?
may we be contributing?
may you be contributing?
may they be contributing? 	may I have contributed?
may you have contributed?
may she 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 she 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 	
mayn't I contribute?
mayn't you contribute?
mayn't she contribute?
mayn't we contribute?
mayn't you contribute?
mayn't they contribute? 	mayn't I be contributing?
mayn't you be contributing?
mayn't she be contributing?
mayn't we be contributing?
mayn't you be contributing?
mayn't they be contributing? 	mayn't I have contributed?
mayn't you have contributed?
mayn't she have contributed?
mayn't we have contributed?
mayn't you have contributed?
mayn't they have contributed? 	mayn't I have been contributing?
mayn't you have been contributing?
mayn't she have been contributing?
mayn't we have been contributing?
mayn't you have been contributing?
mayn't they have been contributing?