English verb conjugation
COULD DEFEND

Regular verb: defend - defended - defended

Affirmation

Simple form	V-ing form
I could defend you could defend he could defend we could defend you could defend they could defend	I could be defending you could be defending he could be defending we could be defending you could be defending they could be defending
Perfect	V-ing perfect
I could have defended you could have defended he could have defended we could have defended you could have defended they could have defended	I could have been defending you could have been defending he could have been defending we could have been defending you could have been defending they could have been defending

Negation

Simple form	V-ing form
I couldn't defend you couldn't defend he couldn't defend we couldn't defend you couldn't defend they couldn't defend	I couldn't be defending you couldn't be defending he couldn't be defending we couldn't be defending you couldn't be defending they couldn't be defending
Perfect	V-ing perfect
I couldn't have defended you couldn't have defended he couldn't have defended we couldn't have defended you couldn't have defended they couldn't have defended	I couldn't have been defending you couldn't have been defending he couldn't have been defending we couldn't have been defending you couldn't have been defending they couldn't have been defending

Interrogative form

Simple form	V-ing form
could I defend? could you defend? could he defend? could we defend? could you defend? could they defend?	could I be defending? could you be defending? could he be defending? could we be defending? could you be defending? could they be defending?
Perfect	V-ing perfect
could I have defended? could you have defended? could he have defended? could we have defended? could you have defended? could they have defended?	could I have been defending? could you have been defending? could he have been defending? could we have been defending? could you have been defending? could they have been defending?

Interro-negative form

Simple form	V-ing form
couldn't I defend? couldn't you defend? couldn't he defend? couldn't we defend? couldn't you defend? couldn't they defend?	couldn't I be defending? couldn't you be defending? couldn't he be defending? couldn't we be defending? couldn't you be defending? couldn't they be defending?
Perfect	V-ing perfect
couldn't I have defended? couldn't you have defended? couldn't he have defended? couldn't we have defended? couldn't you have defended? couldn't they have defended?	couldn't I have been defending? couldn't you have been defending? couldn't he have been defending? couldn't we have been defending? couldn't you have been defending? couldn't they have been defending?