I can frost you can frost he can frost we can frost you can frost they can frost
V-ing form
I can be frosting you can be frosting he can be frosting we can be frosting you can be frosting they can be frosting
Perfect
I can have frosted you can have frosted he can have frosted we can have frosted you can have frosted they can have frosted
V-ing perfect
I can have been frosting you can have been frosting he can have been frosting we can have been frosting you can have been frosting they can have been frosting
Negation
Simple form
I can't frost you can't frost he can't frost we can't frost you can't frost they can't frost
V-ing form
I can't be frosting you can't be frosting he can't be frosting we can't be frosting you can't be frosting they can't be frosting
Perfect
I can't have frosted you can't have frosted he can't have frosted we can't have frosted you can't have frosted they can't have frosted
V-ing perfect
I can't have been frosting you can't have been frosting he can't have been frosting we can't have been frosting you can't have been frosting they can't have been frosting
Interrogative form
Simple form
can I frost? can you frost? can he frost? can we frost? can you frost? can they frost?
V-ing form
can I be frosting? can you be frosting? can he be frosting? can we be frosting? can you be frosting? can they be frosting?
Perfect
can I have frosted? can you have frosted? can he have frosted? can we have frosted? can you have frosted? can they have frosted?
V-ing perfect
can I have been frosting? can you have been frosting? can he have been frosting? can we have been frosting? can you have been frosting? can they have been frosting?
Interro-negative form
Simple form
can't I frost? can't you frost? can't he frost? can't we frost? can't you frost? can't they frost?
V-ing form
can't I be frosting? can't you be frosting? can't he be frosting? can't we be frosting? can't you be frosting? can't they be frosting?
Perfect
can't I have frosted? can't you have frosted? can't he have frosted? can't we have frosted? can't you have frosted? can't they have frosted?
V-ing perfect
can't I have been frosting? can't you have been frosting? can't he have been frosting? can't we have been frosting? can't you have been frosting? can't they have been frosting?