English verb conjugation
COULD HUMIDIFY

Regular verb: humidify - humidified - humidified

Affirmation

Simple form	V-ing form
I could humidify you could humidify he could humidify we could humidify you could humidify they could humidify	I could be humidifying you could be humidifying he could be humidifying we could be humidifying you could be humidifying they could be humidifying
Perfect	V-ing perfect
I could have humidified you could have humidified he could have humidified we could have humidified you could have humidified they could have humidified	I could have been humidifying you could have been humidifying he could have been humidifying we could have been humidifying you could have been humidifying they could have been humidifying

Negation

Simple form	V-ing form
I couldn't humidify you couldn't humidify he couldn't humidify we couldn't humidify you couldn't humidify they couldn't humidify	I couldn't be humidifying you couldn't be humidifying he couldn't be humidifying we couldn't be humidifying you couldn't be humidifying they couldn't be humidifying
Perfect	V-ing perfect
I couldn't have humidified you couldn't have humidified he couldn't have humidified we couldn't have humidified you couldn't have humidified they couldn't have humidified	I couldn't have been humidifying you couldn't have been humidifying he couldn't have been humidifying we couldn't have been humidifying you couldn't have been humidifying they couldn't have been humidifying

Interrogative form

Simple form	V-ing form
could I humidify? could you humidify? could he humidify? could we humidify? could you humidify? could they humidify?	could I be humidifying? could you be humidifying? could he be humidifying? could we be humidifying? could you be humidifying? could they be humidifying?
Perfect	V-ing perfect
could I have humidified? could you have humidified? could he have humidified? could we have humidified? could you have humidified? could they have humidified?	could I have been humidifying? could you have been humidifying? could he have been humidifying? could we have been humidifying? could you have been humidifying? could they have been humidifying?

Interro-negative form

Simple form	V-ing form
couldn't I humidify? couldn't you humidify? couldn't he humidify? couldn't we humidify? couldn't you humidify? couldn't they humidify?	couldn't I be humidifying? couldn't you be humidifying? couldn't he be humidifying? couldn't we be humidifying? couldn't you be humidifying? couldn't they be humidifying?
Perfect	V-ing perfect
couldn't I have humidified? couldn't you have humidified? couldn't he have humidified? couldn't we have humidified? couldn't you have humidified? couldn't they have humidified?	couldn't I have been humidifying? couldn't you have been humidifying? couldn't he have been humidifying? couldn't we have been humidifying? couldn't you have been humidifying? couldn't they have been humidifying?