may crumble
Verbo regular: crumble - crumbled- crumbled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may crumble
you may crumble
he may crumble
we may crumble
you may crumble
they may crumble 	I may be crumbling
you may be crumbling
he may be crumbling
we may be crumbling
you may be crumbling
they may be crumbling	I may have crumbled
you may have crumbled
he may have crumbled
we may have crumbled
you may have crumbled
they may have crumbled	I may have been crumbling
you may have been crumbling
he may have been crumbling
we may have been crumbling
you may have been crumbling
they may have been crumbling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may not crumble
you may not crumble
he may not crumble
we may not crumble
you may not crumble
they may not crumble 	I may not be crumbling
you may not be crumbling
he may not be crumbling
we may not be crumbling
you may not be crumbling
they may not be crumbling	I may not have crumbled
you may not have crumbled
he may not have crumbled
we may not have crumbled
you may not have crumbled
they may not have crumbled	I may not have been crumbling
you may not have been crumbling
he may not have been crumbling
we may not have been crumbling
you may not have been crumbling
they may not have been crumbling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I crumble?
may you crumble?
may he crumble?
may we crumble?
may you crumble?
may they crumble? 	may I be crumbling?
may you be crumbling?
may he be crumbling?
may we be crumbling?
may you be crumbling?
may they be crumbling? 	may I have crumbled?
may you have crumbled?
may he have crumbled?
may we have crumbled?
may you have crumbled?
may they have crumbled? 	may I have been crumbling?
may you have been crumbling?
may he have been crumbling?
may we have been crumbling?
may you have been crumbling?
may they have been crumbling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I not crumble?
may you not crumble?
may he not crumble?
may we not crumble?
may you not crumble?
may they not crumble? 	may I not be crumbling?
may you not be crumbling?
may he not be crumbling?
may we not be crumbling?
may you not be crumbling?
may they not be crumbling? 	may I not have crumbled?
may you not have crumbled?
may he not have crumbled?
may we not have crumbled?
may you not have crumbled?
may they not have crumbled? 	may I not have been crumbling?
may you not have been crumbling?
may he not have been crumbling?
may we not have been crumbling?
may you not have been crumbling?
may they not have been crumbling?