I can grease you can grease she can grease we can grease you can grease they can grease
V-ing form
I can be greasing you can be greasing she can be greasing we can be greasing you can be greasing they can be greasing
Perfect
I can have greased you can have greased she can have greased we can have greased you can have greased they can have greased
V-ing perfect
I can have been greasing you can have been greasing she can have been greasing we can have been greasing you can have been greasing they can have been greasing
Negation
Simple form
I cannot grease you cannot grease she cannot grease we cannot grease you cannot grease they cannot grease
V-ing form
I cannot be greasing you cannot be greasing she cannot be greasing we cannot be greasing you cannot be greasing they cannot be greasing
Perfect
I cannot have greased you cannot have greased she cannot have greased we cannot have greased you cannot have greased they cannot have greased
V-ing perfect
I cannot have been greasing you cannot have been greasing she cannot have been greasing we cannot have been greasing you cannot have been greasing they cannot have been greasing
Interrogative form
Simple form
can I grease? can you grease? can she grease? can we grease? can you grease? can they grease?
V-ing form
can I be greasing? can you be greasing? can she be greasing? can we be greasing? can you be greasing? can they be greasing?
Perfect
can I have greased? can you have greased? can she have greased? can we have greased? can you have greased? can they have greased?
V-ing perfect
can I have been greasing? can you have been greasing? can she have been greasing? can we have been greasing? can you have been greasing? can they have been greasing?
Interro-negative form
Simple form
can I not grease? can you not grease? can she not grease? can we not grease? can you not grease? can they not grease?
V-ing form
can I not be greasing? can you not be greasing? can she not be greasing? can we not be greasing? can you not be greasing? can they not be greasing?
Perfect
can I not have greased? can you not have greased? can she not have greased? can we not have greased? can you not have greased? can they not have greased?
V-ing perfect
can I not have been greasing? can you not have been greasing? can she not have been greasing? can we not have been greasing? can you not have been greasing? can they not have been greasing?