I could punctuate you could punctuate she could punctuate we could punctuate you could punctuate they could punctuate
V-ing form
I could be punctuating you could be punctuating she could be punctuating we could be punctuating you could be punctuating they could be punctuating
Perfect
I could have punctuated you could have punctuated she could have punctuated we could have punctuated you could have punctuated they could have punctuated
V-ing perfect
I could have been punctuating you could have been punctuating she could have been punctuating we could have been punctuating you could have been punctuating they could have been punctuating
Negation
Simple form
I could not punctuate you could not punctuate she could not punctuate we could not punctuate you could not punctuate they could not punctuate
V-ing form
I could not be punctuating you could not be punctuating she could not be punctuating we could not be punctuating you could not be punctuating they could not be punctuating
Perfect
I could not have punctuated you could not have punctuated she could not have punctuated we could not have punctuated you could not have punctuated they could not have punctuated
V-ing perfect
I could not have been punctuating you could not have been punctuating she could not have been punctuating we could not have been punctuating you could not have been punctuating they could not have been punctuating
Interrogative form
Simple form
could I punctuate? could you punctuate? could she punctuate? could we punctuate? could you punctuate? could they punctuate?
V-ing form
could I be punctuating? could you be punctuating? could she be punctuating? could we be punctuating? could you be punctuating? could they be punctuating?
Perfect
could I have punctuated? could you have punctuated? could she have punctuated? could we have punctuated? could you have punctuated? could they have punctuated?
V-ing perfect
could I have been punctuating? could you have been punctuating? could she have been punctuating? could we have been punctuating? could you have been punctuating? could they have been punctuating?
Interro-negative form
Simple form
could I not punctuate? could you not punctuate? could she not punctuate? could we not punctuate? could you not punctuate? could they not punctuate?
V-ing form
could I not be punctuating? could you not be punctuating? could she not be punctuating? could we not be punctuating? could you not be punctuating? could they not be punctuating?
Perfect
could I not have punctuated? could you not have punctuated? could she not have punctuated? could we not have punctuated? could you not have punctuated? could they not have punctuated?
V-ing perfect
could I not have been punctuating? could you not have been punctuating? could she not have been punctuating? could we not have been punctuating? could you not have been punctuating? could they not have been punctuating?