I can crust you can crust he can crust we can crust you can crust they can crust
V-ing form
I can be crusting you can be crusting he can be crusting we can be crusting you can be crusting they can be crusting
Perfect
I can have crusted you can have crusted he can have crusted we can have crusted you can have crusted they can have crusted
V-ing perfect
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
I cannot crust you cannot crust he cannot crust we cannot crust you cannot crust they cannot crust
V-ing form
I cannot be crusting you cannot be crusting he cannot be crusting we cannot be crusting you cannot be crusting they cannot be crusting
Perfect
I cannot have crusted you cannot have crusted he cannot have crusted we cannot have crusted you cannot have crusted they cannot have crusted
V-ing perfect
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
can I crust? can you crust? can he crust? can we crust? can you crust? can they crust?
V-ing form
can I be crusting? can you be crusting? can he be crusting? can we be crusting? can you be crusting? can they be crusting?
Perfect
can I have crusted? can you have crusted? can he have crusted? can we have crusted? can you have crusted? can they have crusted?
V-ing perfect
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
can I not crust? can you not crust? can he not crust? can we not crust? can you not crust? can they not crust?
V-ing form
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?
Perfect
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?
V-ing perfect
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?