English verb conjugation
CAN PREFIX

Regular verb: prefix - prefixed - prefixed

Affirmation

Simple form	V-ing form
I can prefix you can prefix he can prefix we can prefix you can prefix they can prefix	I can be prefixing you can be prefixing he can be prefixing we can be prefixing you can be prefixing they can be prefixing
Perfect	V-ing perfect
I can have prefixed you can have prefixed he can have prefixed we can have prefixed you can have prefixed they can have prefixed	I can have been prefixing you can have been prefixing he can have been prefixing we can have been prefixing you can have been prefixing they can have been prefixing

Negation

Simple form	V-ing form
I can't prefix you can't prefix he can't prefix we can't prefix you can't prefix they can't prefix	I can't be prefixing you can't be prefixing he can't be prefixing we can't be prefixing you can't be prefixing they can't be prefixing
Perfect	V-ing perfect
I can't have prefixed you can't have prefixed he can't have prefixed we can't have prefixed you can't have prefixed they can't have prefixed	I can't have been prefixing you can't have been prefixing he can't have been prefixing we can't have been prefixing you can't have been prefixing they can't have been prefixing

Interrogative form

Simple form	V-ing form
can I prefix? can you prefix? can he prefix? can we prefix? can you prefix? can they prefix?	can I be prefixing? can you be prefixing? can he be prefixing? can we be prefixing? can you be prefixing? can they be prefixing?
Perfect	V-ing perfect
can I have prefixed? can you have prefixed? can he have prefixed? can we have prefixed? can you have prefixed? can they have prefixed?	can I have been prefixing? can you have been prefixing? can he have been prefixing? can we have been prefixing? can you have been prefixing? can they have been prefixing?

Interro-negative form

Simple form	V-ing form
can't I prefix? can't you prefix? can't he prefix? can't we prefix? can't you prefix? can't they prefix?	can't I be prefixing? can't you be prefixing? can't he be prefixing? can't we be prefixing? can't you be prefixing? can't they be prefixing?
Perfect	V-ing perfect
can't I have prefixed? can't you have prefixed? can't he have prefixed? can't we have prefixed? can't you have prefixed? can't they have prefixed?	can't I have been prefixing? can't you have been prefixing? can't he have been prefixing? can't we have been prefixing? can't you have been prefixing? can't they have been prefixing?