English verb conjugation
COULD DIFFUSE

Regular verb: diffuse - diffused - diffused

Affirmation

Simple form	V-ing form
I could diffuse you could diffuse he could diffuse we could diffuse you could diffuse they could diffuse	I could be diffusing you could be diffusing he could be diffusing we could be diffusing you could be diffusing they could be diffusing
Perfect	V-ing perfect
I could have diffused you could have diffused he could have diffused we could have diffused you could have diffused they could have diffused	I could have been diffusing you could have been diffusing he could have been diffusing we could have been diffusing you could have been diffusing they could have been diffusing

Negation

Simple form	V-ing form
I couldn't diffuse you couldn't diffuse he couldn't diffuse we couldn't diffuse you couldn't diffuse they couldn't diffuse	I couldn't be diffusing you couldn't be diffusing he couldn't be diffusing we couldn't be diffusing you couldn't be diffusing they couldn't be diffusing
Perfect	V-ing perfect
I couldn't have diffused you couldn't have diffused he couldn't have diffused we couldn't have diffused you couldn't have diffused they couldn't have diffused	I couldn't have been diffusing you couldn't have been diffusing he couldn't have been diffusing we couldn't have been diffusing you couldn't have been diffusing they couldn't have been diffusing

Interrogative form

Simple form	V-ing form
could I diffuse? could you diffuse? could he diffuse? could we diffuse? could you diffuse? could they diffuse?	could I be diffusing? could you be diffusing? could he be diffusing? could we be diffusing? could you be diffusing? could they be diffusing?
Perfect	V-ing perfect
could I have diffused? could you have diffused? could he have diffused? could we have diffused? could you have diffused? could they have diffused?	could I have been diffusing? could you have been diffusing? could he have been diffusing? could we have been diffusing? could you have been diffusing? could they have been diffusing?

Interro-negative form

Simple form	V-ing form
couldn't I diffuse? couldn't you diffuse? couldn't he diffuse? couldn't we diffuse? couldn't you diffuse? couldn't they diffuse?	couldn't I be diffusing? couldn't you be diffusing? couldn't he be diffusing? couldn't we be diffusing? couldn't you be diffusing? couldn't they be diffusing?
Perfect	V-ing perfect
couldn't I have diffused? couldn't you have diffused? couldn't he have diffused? couldn't we have diffused? couldn't you have diffused? couldn't they have diffused?	couldn't I have been diffusing? couldn't you have been diffusing? couldn't he have been diffusing? couldn't we have been diffusing? couldn't you have been diffusing? couldn't they have been diffusing?