can crust
Regular verb: crust - crusted- crusted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can crust
you can crust
he can crust
we can crust
you can crust
they can crust 	I can be crusting
you can be crusting
he can be crusting
we can be crusting
you can be crusting
they can be crusting	I can have crusted
you can have crusted
he can have crusted
we can have crusted
you can have crusted
they can have crusted	I can have been crusting
you can have been crusting
he can have been crusting
we can have been crusting
you can have been crusting
they can have been crusting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot crust
you cannot crust
he cannot crust
we cannot crust
you cannot crust
they cannot crust 	I cannot be crusting
you cannot be crusting
he cannot be crusting
we cannot be crusting
you cannot be crusting
they cannot be crusting	I cannot have crusted
you cannot have crusted
he cannot have crusted
we cannot have crusted
you cannot have crusted
they cannot have crusted	I cannot have been crusting
you cannot have been crusting
he cannot have been crusting
we cannot have been crusting
you cannot have been crusting
they cannot have been crusting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I crust?
can you crust?
can he crust?
can we crust?
can you crust?
can they crust? 	can I be crusting?
can you be crusting?
can he be crusting?
can we be crusting?
can you be crusting?
can they be crusting? 	can I have crusted?
can you have crusted?
can he have crusted?
can we have crusted?
can you have crusted?
can they have crusted? 	can I have been crusting?
can you have been crusting?
can he have been crusting?
can we have been crusting?
can you have been crusting?
can they have been crusting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not crust?
can you not crust?
can he not crust?
can we not crust?
can you not crust?
can they not crust? 	can I not be crusting?
can you not be crusting?
can he not be crusting?
can we not be crusting?
can you not be crusting?
can they not be crusting? 	can I not have crusted?
can you not have crusted?
can he not have crusted?
can we not have crusted?
can you not have crusted?
can they not have crusted? 	can I not have been crusting?
can you not have been crusting?
can he not have been crusting?
can we not have been crusting?
can you not have been crusting?
can they not have been crusting?