English verb conjugation
COULD PLOW

Regular verb: plow - plowed - plowed

Affirmation

Simple form	V-ing form
I could plow you could plow she could plow we could plow you could plow they could plow	I could be plowing you could be plowing she could be plowing we could be plowing you could be plowing they could be plowing
Perfect	V-ing perfect
I could have plowed you could have plowed she could have plowed we could have plowed you could have plowed they could have plowed	I could have been plowing you could have been plowing she could have been plowing we could have been plowing you could have been plowing they could have been plowing

Negation

Simple form	V-ing form
I couldn't plow you couldn't plow she couldn't plow we couldn't plow you couldn't plow they couldn't plow	I couldn't be plowing you couldn't be plowing she couldn't be plowing we couldn't be plowing you couldn't be plowing they couldn't be plowing
Perfect	V-ing perfect
I couldn't have plowed you couldn't have plowed she couldn't have plowed we couldn't have plowed you couldn't have plowed they couldn't have plowed	I couldn't have been plowing you couldn't have been plowing she couldn't have been plowing we couldn't have been plowing you couldn't have been plowing they couldn't have been plowing

Interrogative form

Simple form	V-ing form
could I plow? could you plow? could she plow? could we plow? could you plow? could they plow?	could I be plowing? could you be plowing? could she be plowing? could we be plowing? could you be plowing? could they be plowing?
Perfect	V-ing perfect
could I have plowed? could you have plowed? could she have plowed? could we have plowed? could you have plowed? could they have plowed?	could I have been plowing? could you have been plowing? could she have been plowing? could we have been plowing? could you have been plowing? could they have been plowing?

Interro-negative form

Simple form	V-ing form
couldn't I plow? couldn't you plow? couldn't she plow? couldn't we plow? couldn't you plow? couldn't they plow?	couldn't I be plowing? couldn't you be plowing? couldn't she be plowing? couldn't we be plowing? couldn't you be plowing? couldn't they be plowing?
Perfect	V-ing perfect
couldn't I have plowed? couldn't you have plowed? couldn't she have plowed? couldn't we have plowed? couldn't you have plowed? couldn't they have plowed?	couldn't I have been plowing? couldn't you have been plowing? couldn't she have been plowing? couldn't we have been plowing? couldn't you have been plowing? couldn't they have been plowing?