I could note you could note he could note we could note you could note they could note
V-ing form
I could be noting you could be noting he could be noting we could be noting you could be noting they could be noting
Perfect
I could have noted you could have noted he could have noted we could have noted you could have noted they could have noted
V-ing perfect
I could have been noting you could have been noting he could have been noting we could have been noting you could have been noting they could have been noting
Negation
Simple form
I couldn't note you couldn't note he couldn't note we couldn't note you couldn't note they couldn't note
V-ing form
I couldn't be noting you couldn't be noting he couldn't be noting we couldn't be noting you couldn't be noting they couldn't be noting
Perfect
I couldn't have noted you couldn't have noted he couldn't have noted we couldn't have noted you couldn't have noted they couldn't have noted
V-ing perfect
I couldn't have been noting you couldn't have been noting he couldn't have been noting we couldn't have been noting you couldn't have been noting they couldn't have been noting
Interrogative form
Simple form
could I note? could you note? could he note? could we note? could you note? could they note?
V-ing form
could I be noting? could you be noting? could he be noting? could we be noting? could you be noting? could they be noting?
Perfect
could I have noted? could you have noted? could he have noted? could we have noted? could you have noted? could they have noted?
V-ing perfect
could I have been noting? could you have been noting? could he have been noting? could we have been noting? could you have been noting? could they have been noting?
Interro-negative form
Simple form
couldn't I note? couldn't you note? couldn't he note? couldn't we note? couldn't you note? couldn't they note?
V-ing form
couldn't I be noting? couldn't you be noting? couldn't he be noting? couldn't we be noting? couldn't you be noting? couldn't they be noting?
Perfect
couldn't I have noted? couldn't you have noted? couldn't he have noted? couldn't we have noted? couldn't you have noted? couldn't they have noted?
V-ing perfect
couldn't I have been noting? couldn't you have been noting? couldn't he have been noting? couldn't we have been noting? couldn't you have been noting? couldn't they have been noting?