English verb conjugation
CAN COMMENT

Regular verb: comment - commented - commented

Affirmation

Simple form	V-ing form
I can comment you can comment she can comment we can comment you can comment they can comment	I can be commenting you can be commenting she 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 she 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 she 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 cannot comment you cannot comment she cannot comment we cannot comment you cannot comment they cannot comment	I cannot be commenting you cannot be commenting she cannot be commenting we cannot be commenting you cannot be commenting they cannot be commenting
Perfect	V-ing perfect
I cannot have commented you cannot have commented she cannot have commented we cannot have commented you cannot have commented they cannot have commented	I cannot have been commenting you cannot have been commenting she cannot have been commenting we cannot have been commenting you cannot have been commenting they cannot have been commenting

Interrogative form

Simple form	V-ing form
can I comment? can you comment? can she comment? can we comment? can you comment? can they comment?	can I be commenting? can you be commenting? can she 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 she 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 she 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 I not comment? can you not comment? can she not comment? can we not comment? can you not comment? can they not comment?	can I not be commenting? can you not be commenting? can she not be commenting? can we not be commenting? can you not be commenting? can they not be commenting?
Perfect	V-ing perfect
can I not have commented? can you not have commented? can she not have commented? can we not have commented? can you not have commented? can they not have commented?	can I not have been commenting? can you not have been commenting? can she not have been commenting? can we not have been commenting? can you not have been commenting? can they not have been commenting?