I could antiquate you could antiquate she could antiquate we could antiquate you could antiquate they could antiquate
V-ing form
I could be antiquating you could be antiquating she could be antiquating we could be antiquating you could be antiquating they could be antiquating
Perfect
I could have antiquated you could have antiquated she could have antiquated we could have antiquated you could have antiquated they could have antiquated
V-ing perfect
I could have been antiquating you could have been antiquating she could have been antiquating we could have been antiquating you could have been antiquating they could have been antiquating
Negation
Simple form
I could not antiquate you could not antiquate she could not antiquate we could not antiquate you could not antiquate they could not antiquate
V-ing form
I could not be antiquating you could not be antiquating she could not be antiquating we could not be antiquating you could not be antiquating they could not be antiquating
Perfect
I could not have antiquated you could not have antiquated she could not have antiquated we could not have antiquated you could not have antiquated they could not have antiquated
V-ing perfect
I could not have been antiquating you could not have been antiquating she could not have been antiquating we could not have been antiquating you could not have been antiquating they could not have been antiquating
Interrogative form
Simple form
could I antiquate? could you antiquate? could she antiquate? could we antiquate? could you antiquate? could they antiquate?
V-ing form
could I be antiquating? could you be antiquating? could she be antiquating? could we be antiquating? could you be antiquating? could they be antiquating?
Perfect
could I have antiquated? could you have antiquated? could she have antiquated? could we have antiquated? could you have antiquated? could they have antiquated?
V-ing perfect
could I have been antiquating? could you have been antiquating? could she have been antiquating? could we have been antiquating? could you have been antiquating? could they have been antiquating?
Interro-negative form
Simple form
could I not antiquate? could you not antiquate? could she not antiquate? could we not antiquate? could you not antiquate? could they not antiquate?
V-ing form
could I not be antiquating? could you not be antiquating? could she not be antiquating? could we not be antiquating? could you not be antiquating? could they not be antiquating?
Perfect
could I not have antiquated? could you not have antiquated? could she not have antiquated? could we not have antiquated? could you not have antiquated? could they not have antiquated?
V-ing perfect
could I not have been antiquating? could you not have been antiquating? could she not have been antiquating? could we not have been antiquating? could you not have been antiquating? could they not have been antiquating?