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 cannot suffix you cannot suffix he cannot suffix we cannot suffix you cannot suffix they cannot suffix	I cannot be suffixing you cannot be suffixing he cannot be suffixing we cannot be suffixing you cannot be suffixing they cannot be suffixing
Perfect	V-ing perfect
I cannot have suffixed you cannot have suffixed he cannot have suffixed we cannot have suffixed you cannot have suffixed they cannot have suffixed	I cannot have been suffixing you cannot have been suffixing he cannot have been suffixing we cannot have been suffixing you cannot have been suffixing they cannot 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 I not suffix? can you not suffix? can he not suffix? can we not suffix? can you not suffix? can they not suffix?	can I not be suffixing? can you not be suffixing? can he not be suffixing? can we not be suffixing? can you not be suffixing? can they not be suffixing?
Perfect	V-ing perfect
can I not have suffixed? can you not have suffixed? can he not have suffixed? can we not have suffixed? can you not have suffixed? can they not have suffixed?	can I not have been suffixing? can you not have been suffixing? can he not have been suffixing? can we not have been suffixing? can you not have been suffixing? can they not have been suffixing?