English verb conjugation
CAN POSTFIX

Regular verb: postfix - postfixed - postfixed

Affirmation

Simple form	V-ing form
I can postfix you can postfix she can postfix we can postfix you can postfix they can postfix	I can be postfixing you can be postfixing she can be postfixing we can be postfixing you can be postfixing they can be postfixing
Perfect	V-ing perfect
I can have postfixed you can have postfixed she can have postfixed we can have postfixed you can have postfixed they can have postfixed	I can have been postfixing you can have been postfixing she can have been postfixing we can have been postfixing you can have been postfixing they can have been postfixing

Negation

Simple form	V-ing form
I can't postfix you can't postfix she can't postfix we can't postfix you can't postfix they can't postfix	I can't be postfixing you can't be postfixing she can't be postfixing we can't be postfixing you can't be postfixing they can't be postfixing
Perfect	V-ing perfect
I can't have postfixed you can't have postfixed she can't have postfixed we can't have postfixed you can't have postfixed they can't have postfixed	I can't have been postfixing you can't have been postfixing she can't have been postfixing we can't have been postfixing you can't have been postfixing they can't have been postfixing

Interrogative form

Simple form	V-ing form
can I postfix? can you postfix? can she postfix? can we postfix? can you postfix? can they postfix?	can I be postfixing? can you be postfixing? can she be postfixing? can we be postfixing? can you be postfixing? can they be postfixing?
Perfect	V-ing perfect
can I have postfixed? can you have postfixed? can she have postfixed? can we have postfixed? can you have postfixed? can they have postfixed?	can I have been postfixing? can you have been postfixing? can she have been postfixing? can we have been postfixing? can you have been postfixing? can they have been postfixing?

Interro-negative form

Simple form	V-ing form
can't I postfix? can't you postfix? can't she postfix? can't we postfix? can't you postfix? can't they postfix?	can't I be postfixing? can't you be postfixing? can't she be postfixing? can't we be postfixing? can't you be postfixing? can't they be postfixing?
Perfect	V-ing perfect
can't I have postfixed? can't you have postfixed? can't she have postfixed? can't we have postfixed? can't you have postfixed? can't they have postfixed?	can't I have been postfixing? can't you have been postfixing? can't she have been postfixing? can't we have been postfixing? can't you have been postfixing? can't they have been postfixing?