English verb conjugation
CAN COMMENT

Regular verb: comment - commented - commented

Affirmation

Simple form	V-ing form
I can comment you can comment he can comment we can comment you can comment they can comment	I can be commenting you can be commenting he can be commenting we can be commenting you can be commenting they can be commenting
Perfect	V-ing perfect
I can have commented you can have commented he can have commented we can have commented you can have commented they can have commented	I can have been commenting you can have been commenting he can have been commenting we can have been commenting you can have been commenting they can have been commenting

Negation

Simple form	V-ing form
I can't comment you can't comment he can't comment we can't comment you can't comment they can't comment	I can't be commenting you can't be commenting he can't be commenting we can't be commenting you can't be commenting they can't be commenting
Perfect	V-ing perfect
I can't have commented you can't have commented he can't have commented we can't have commented you can't have commented they can't have commented	I can't have been commenting you can't have been commenting he can't have been commenting we can't have been commenting you can't have been commenting they can't have been commenting

Interrogative form

Simple form	V-ing form
can I comment? can you comment? can he comment? can we comment? can you comment? can they comment?	can I be commenting? can you be commenting? can he be commenting? can we be commenting? can you be commenting? can they be commenting?
Perfect	V-ing perfect
can I have commented? can you have commented? can he have commented? can we have commented? can you have commented? can they have commented?	can I have been commenting? can you have been commenting? can he have been commenting? can we have been commenting? can you have been commenting? can they have been commenting?

Interro-negative form

Simple form	V-ing form
can't I comment? can't you comment? can't he comment? can't we comment? can't you comment? can't they comment?	can't I be commenting? can't you be commenting? can't he be commenting? can't we be commenting? can't you be commenting? can't they be commenting?
Perfect	V-ing perfect
can't I have commented? can't you have commented? can't he have commented? can't we have commented? can't you have commented? can't they have commented?	can't I have been commenting? can't you have been commenting? can't he have been commenting? can't we have been commenting? can't you have been commenting? can't they have been commenting?