I can row you can row he can row we can row you can row they can row
V-ing form
I can be rowing you can be rowing he can be rowing we can be rowing you can be rowing they can be rowing
Perfect
I can have rowed you can have rowed he can have rowed we can have rowed you can have rowed they can have rowed
V-ing perfect
I can have been rowing you can have been rowing he can have been rowing we can have been rowing you can have been rowing they can have been rowing
Negation
Simple form
I cannot row you cannot row he cannot row we cannot row you cannot row they cannot row
V-ing form
I cannot be rowing you cannot be rowing he cannot be rowing we cannot be rowing you cannot be rowing they cannot be rowing
Perfect
I cannot have rowed you cannot have rowed he cannot have rowed we cannot have rowed you cannot have rowed they cannot have rowed
V-ing perfect
I cannot have been rowing you cannot have been rowing he cannot have been rowing we cannot have been rowing you cannot have been rowing they cannot have been rowing
Interrogative form
Simple form
can I row? can you row? can he row? can we row? can you row? can they row?
V-ing form
can I be rowing? can you be rowing? can he be rowing? can we be rowing? can you be rowing? can they be rowing?
Perfect
can I have rowed? can you have rowed? can he have rowed? can we have rowed? can you have rowed? can they have rowed?
V-ing perfect
can I have been rowing? can you have been rowing? can he have been rowing? can we have been rowing? can you have been rowing? can they have been rowing?
Interro-negative form
Simple form
can I not row? can you not row? can he not row? can we not row? can you not row? can they not row?
V-ing form
can I not be rowing? can you not be rowing? can he not be rowing? can we not be rowing? can you not be rowing? can they not be rowing?
Perfect
can I not have rowed? can you not have rowed? can he not have rowed? can we not have rowed? can you not have rowed? can they not have rowed?
V-ing perfect
can I not have been rowing? can you not have been rowing? can he not have been rowing? can we not have been rowing? can you not have been rowing? can they not have been rowing?