I can furrow you can furrow he can furrow we can furrow you can furrow they can furrow
V-ing form
I can be furrowing you can be furrowing he can be furrowing we can be furrowing you can be furrowing they can be furrowing
Perfect
I can have furrowed you can have furrowed he can have furrowed we can have furrowed you can have furrowed they can have furrowed
V-ing perfect
I can have been furrowing you can have been furrowing he can have been furrowing we can have been furrowing you can have been furrowing they can have been furrowing
Negation
Simple form
I cannot furrow you cannot furrow he cannot furrow we cannot furrow you cannot furrow they cannot furrow
V-ing form
I cannot be furrowing you cannot be furrowing he cannot be furrowing we cannot be furrowing you cannot be furrowing they cannot be furrowing
Perfect
I cannot have furrowed you cannot have furrowed he cannot have furrowed we cannot have furrowed you cannot have furrowed they cannot have furrowed
V-ing perfect
I cannot have been furrowing you cannot have been furrowing he cannot have been furrowing we cannot have been furrowing you cannot have been furrowing they cannot have been furrowing
Interrogative form
Simple form
can I furrow? can you furrow? can he furrow? can we furrow? can you furrow? can they furrow?
V-ing form
can I be furrowing? can you be furrowing? can he be furrowing? can we be furrowing? can you be furrowing? can they be furrowing?
Perfect
can I have furrowed? can you have furrowed? can he have furrowed? can we have furrowed? can you have furrowed? can they have furrowed?
V-ing perfect
can I have been furrowing? can you have been furrowing? can he have been furrowing? can we have been furrowing? can you have been furrowing? can they have been furrowing?
Interro-negative form
Simple form
can I not furrow? can you not furrow? can he not furrow? can we not furrow? can you not furrow? can they not furrow?
V-ing form
can I not be furrowing? can you not be furrowing? can he not be furrowing? can we not be furrowing? can you not be furrowing? can they not be furrowing?
Perfect
can I not have furrowed? can you not have furrowed? can he not have furrowed? can we not have furrowed? can you not have furrowed? can they not have furrowed?
V-ing perfect
can I not have been furrowing? can you not have been furrowing? can he not have been furrowing? can we not have been furrowing? can you not have been furrowing? can they not have been furrowing?