English verb conjugation
CAN DEFEND

Regular verb: defend - defended - defended

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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