I can frost you can frost she can frost we can frost you can frost they can frost
V-ing form
I can be frosting you can be frosting she can be frosting we can be frosting you can be frosting they can be frosting
Perfect
I can have frosted you can have frosted she 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 she can have been frosting we can have been frosting you can have been frosting they can have been frosting
Negation
Simple form
I cannot frost you cannot frost she cannot frost we cannot frost you cannot frost they cannot frost
V-ing form
I cannot be frosting you cannot be frosting she cannot be frosting we cannot be frosting you cannot be frosting they cannot be frosting
Perfect
I cannot have frosted you cannot have frosted she cannot have frosted we cannot have frosted you cannot have frosted they cannot have frosted
V-ing perfect
I cannot have been frosting you cannot have been frosting she cannot have been frosting we cannot have been frosting you cannot have been frosting they cannot have been frosting
Interrogative form
Simple form
can I frost? can you frost? can she frost? can we frost? can you frost? can they frost?
V-ing form
can I be frosting? can you be frosting? can she be frosting? can we be frosting? can you be frosting? can they be frosting?
Perfect
can I have frosted? can you have frosted? can she 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 she have been frosting? can we have been frosting? can you have been frosting? can they have been frosting?
Interro-negative form
Simple form
can I not frost? can you not frost? can she not frost? can we not frost? can you not frost? can they not frost?
V-ing form
can I not be frosting? can you not be frosting? can she not be frosting? can we not be frosting? can you not be frosting? can they not be frosting?
Perfect
can I not have frosted? can you not have frosted? can she not have frosted? can we not have frosted? can you not have frosted? can they not have frosted?
V-ing perfect
can I not have been frosting? can you not have been frosting? can she not have been frosting? can we not have been frosting? can you not have been frosting? can they not have been frosting?