may lack
Verbo regular: lack - lacked- lacked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may lack
you may lack
he may lack
we may lack
you may lack
they may lack 	I may be lacking
you may be lacking
he may be lacking
we may be lacking
you may be lacking
they may be lacking	I may have lacked
you may have lacked
he may have lacked
we may have lacked
you may have lacked
they may have lacked	I may have been lacking
you may have been lacking
he may have been lacking
we may have been lacking
you may have been lacking
they may have been lacking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may not lack
you may not lack
he may not lack
we may not lack
you may not lack
they may not lack 	I may not be lacking
you may not be lacking
he may not be lacking
we may not be lacking
you may not be lacking
they may not be lacking	I may not have lacked
you may not have lacked
he may not have lacked
we may not have lacked
you may not have lacked
they may not have lacked	I may not have been lacking
you may not have been lacking
he may not have been lacking
we may not have been lacking
you may not have been lacking
they may not have been lacking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I lack?
may you lack?
may he lack?
may we lack?
may you lack?
may they lack? 	may I be lacking?
may you be lacking?
may he be lacking?
may we be lacking?
may you be lacking?
may they be lacking? 	may I have lacked?
may you have lacked?
may he have lacked?
may we have lacked?
may you have lacked?
may they have lacked? 	may I have been lacking?
may you have been lacking?
may he have been lacking?
may we have been lacking?
may you have been lacking?
may they have been lacking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I not lack?
may you not lack?
may he not lack?
may we not lack?
may you not lack?
may they not lack? 	may I not be lacking?
may you not be lacking?
may he not be lacking?
may we not be lacking?
may you not be lacking?
may they not be lacking? 	may I not have lacked?
may you not have lacked?
may he not have lacked?
may we not have lacked?
may you not have lacked?
may they not have lacked? 	may I not have been lacking?
may you not have been lacking?
may he not have been lacking?
may we not have been lacking?
may you not have been lacking?
may they not have been lacking?