I can postulate you can postulate he can postulate we can postulate you can postulate they can postulate
V-ing form
I can be postulating you can be postulating he can be postulating we can be postulating you can be postulating they can be postulating
Perfect
I can have postulated you can have postulated he can have postulated we can have postulated you can have postulated they can have postulated
V-ing perfect
I can have been postulating you can have been postulating he can have been postulating we can have been postulating you can have been postulating they can have been postulating
Negation
Simple form
I cannot postulate you cannot postulate he cannot postulate we cannot postulate you cannot postulate they cannot postulate
V-ing form
I cannot be postulating you cannot be postulating he cannot be postulating we cannot be postulating you cannot be postulating they cannot be postulating
Perfect
I cannot have postulated you cannot have postulated he cannot have postulated we cannot have postulated you cannot have postulated they cannot have postulated
V-ing perfect
I cannot have been postulating you cannot have been postulating he cannot have been postulating we cannot have been postulating you cannot have been postulating they cannot have been postulating
Interrogative form
Simple form
can I postulate? can you postulate? can he postulate? can we postulate? can you postulate? can they postulate?
V-ing form
can I be postulating? can you be postulating? can he be postulating? can we be postulating? can you be postulating? can they be postulating?
Perfect
can I have postulated? can you have postulated? can he have postulated? can we have postulated? can you have postulated? can they have postulated?
V-ing perfect
can I have been postulating? can you have been postulating? can he have been postulating? can we have been postulating? can you have been postulating? can they have been postulating?
Interro-negative form
Simple form
can I not postulate? can you not postulate? can he not postulate? can we not postulate? can you not postulate? can they not postulate?
V-ing form
can I not be postulating? can you not be postulating? can he not be postulating? can we not be postulating? can you not be postulating? can they not be postulating?
Perfect
can I not have postulated? can you not have postulated? can he not have postulated? can we not have postulated? can you not have postulated? can they not have postulated?
V-ing perfect
can I not have been postulating? can you not have been postulating? can he not have been postulating? can we not have been postulating? can you not have been postulating? can they not have been postulating?