English verb conjugation
COULD COMMENT

Regular verb: comment - commented - commented

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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