can lack
Verbo regular: lack - lacked- lacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can lack
you can lack
he can lack
we can lack
you can lack
they can lack 	I can be lacking
you can be lacking
he can be lacking
we can be lacking
you can be lacking
they can be lacking	I can have lacked
you can have lacked
he can have lacked
we can have lacked
you can have lacked
they can have lacked	I can have been lacking
you can have been lacking
he can have been lacking
we can have been lacking
you can have been lacking
they can have been lacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot lack
you cannot lack
he cannot lack
we cannot lack
you cannot lack
they cannot lack 	I cannot be lacking
you cannot be lacking
he cannot be lacking
we cannot be lacking
you cannot be lacking
they cannot be lacking	I cannot have lacked
you cannot have lacked
he cannot have lacked
we cannot have lacked
you cannot have lacked
they cannot have lacked	I cannot have been lacking
you cannot have been lacking
he cannot have been lacking
we cannot have been lacking
you cannot have been lacking
they cannot have been lacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I lack?
can you lack?
can he lack?
can we lack?
can you lack?
can they lack? 	can I be lacking?
can you be lacking?
can he be lacking?
can we be lacking?
can you be lacking?
can they be lacking? 	can I have lacked?
can you have lacked?
can he have lacked?
can we have lacked?
can you have lacked?
can they have lacked? 	can I have been lacking?
can you have been lacking?
can he have been lacking?
can we have been lacking?
can you have been lacking?
can they have been lacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not lack?
can you not lack?
can he not lack?
can we not lack?
can you not lack?
can they not lack? 	can I not be lacking?
can you not be lacking?
can he not be lacking?
can we not be lacking?
can you not be lacking?
can they not be lacking? 	can I not have lacked?
can you not have lacked?
can he not have lacked?
can we not have lacked?
can you not have lacked?
can they not have lacked? 	can I not have been lacking?
can you not have been lacking?
can he not have been lacking?
can we not have been lacking?
can you not have been lacking?
can they not have been lacking?