English verb conjugation
CAN FURROW

Regular verb: furrow - furrowed - furrowed

Affirmation

Simple form	V-ing form
I can furrow you can furrow he can furrow we can furrow you can furrow they can furrow	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	V-ing 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	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	V-ing form
I can't furrow you can't furrow he can't furrow we can't furrow you can't furrow they can't furrow	I can't be furrowing you can't be furrowing he can't be furrowing we can't be furrowing you can't be furrowing they can't be furrowing
Perfect	V-ing perfect
I can't have furrowed you can't have furrowed he can't have furrowed we can't have furrowed you can't have furrowed they can't have furrowed	I can't have been furrowing you can't have been furrowing he can't have been furrowing we can't have been furrowing you can't have been furrowing they can't have been furrowing

Interrogative form

Simple form	V-ing form
can I furrow? can you furrow? can he furrow? can we furrow? can you furrow? can they furrow?	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	V-ing 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?	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	V-ing form
can't I furrow? can't you furrow? can't he furrow? can't we furrow? can't you furrow? can't they furrow?	can't I be furrowing? can't you be furrowing? can't he be furrowing? can't we be furrowing? can't you be furrowing? can't they be furrowing?
Perfect	V-ing perfect
can't I have furrowed? can't you have furrowed? can't he have furrowed? can't we have furrowed? can't you have furrowed? can't they have furrowed?	can't I have been furrowing? can't you have been furrowing? can't he have been furrowing? can't we have been furrowing? can't you have been furrowing? can't they have been furrowing?