English verb conjugation
CAN SUFFIX

Regular verb: suffix - suffixed - suffixed

Affirmation

Simple form	V-ing form
I can suffix you can suffix he can suffix we can suffix you can suffix they can suffix	I can be suffixing you can be suffixing he can be suffixing we can be suffixing you can be suffixing they can be suffixing
Perfect	V-ing perfect
I can have suffixed you can have suffixed he can have suffixed we can have suffixed you can have suffixed they can have suffixed	I can have been suffixing you can have been suffixing he can have been suffixing we can have been suffixing you can have been suffixing they can have been suffixing

Negation

Simple form	V-ing form
I can't suffix you can't suffix he can't suffix we can't suffix you can't suffix they can't suffix	I can't be suffixing you can't be suffixing he can't be suffixing we can't be suffixing you can't be suffixing they can't be suffixing
Perfect	V-ing perfect
I can't have suffixed you can't have suffixed he can't have suffixed we can't have suffixed you can't have suffixed they can't have suffixed	I can't have been suffixing you can't have been suffixing he can't have been suffixing we can't have been suffixing you can't have been suffixing they can't have been suffixing

Interrogative form

Simple form	V-ing form
can I suffix? can you suffix? can he suffix? can we suffix? can you suffix? can they suffix?	can I be suffixing? can you be suffixing? can he be suffixing? can we be suffixing? can you be suffixing? can they be suffixing?
Perfect	V-ing perfect
can I have suffixed? can you have suffixed? can he have suffixed? can we have suffixed? can you have suffixed? can they have suffixed?	can I have been suffixing? can you have been suffixing? can he have been suffixing? can we have been suffixing? can you have been suffixing? can they have been suffixing?

Interro-negative form

Simple form	V-ing form
can't I suffix? can't you suffix? can't he suffix? can't we suffix? can't you suffix? can't they suffix?	can't I be suffixing? can't you be suffixing? can't he be suffixing? can't we be suffixing? can't you be suffixing? can't they be suffixing?
Perfect	V-ing perfect
can't I have suffixed? can't you have suffixed? can't he have suffixed? can't we have suffixed? can't you have suffixed? can't they have suffixed?	can't I have been suffixing? can't you have been suffixing? can't he have been suffixing? can't we have been suffixing? can't you have been suffixing? can't they have been suffixing?