I can cumulate you can cumulate he can cumulate we can cumulate you can cumulate they can cumulate
V-ing form
I can be cumulating you can be cumulating he can be cumulating we can be cumulating you can be cumulating they can be cumulating
Perfect
I can have cumulated you can have cumulated he can have cumulated we can have cumulated you can have cumulated they can have cumulated
V-ing perfect
I can have been cumulating you can have been cumulating he can have been cumulating we can have been cumulating you can have been cumulating they can have been cumulating
Negation
Simple form
I can't cumulate you can't cumulate he can't cumulate we can't cumulate you can't cumulate they can't cumulate
V-ing form
I can't be cumulating you can't be cumulating he can't be cumulating we can't be cumulating you can't be cumulating they can't be cumulating
Perfect
I can't have cumulated you can't have cumulated he can't have cumulated we can't have cumulated you can't have cumulated they can't have cumulated
V-ing perfect
I can't have been cumulating you can't have been cumulating he can't have been cumulating we can't have been cumulating you can't have been cumulating they can't have been cumulating
Interrogative form
Simple form
can I cumulate? can you cumulate? can he cumulate? can we cumulate? can you cumulate? can they cumulate?
V-ing form
can I be cumulating? can you be cumulating? can he be cumulating? can we be cumulating? can you be cumulating? can they be cumulating?
Perfect
can I have cumulated? can you have cumulated? can he have cumulated? can we have cumulated? can you have cumulated? can they have cumulated?
V-ing perfect
can I have been cumulating? can you have been cumulating? can he have been cumulating? can we have been cumulating? can you have been cumulating? can they have been cumulating?
Interro-negative form
Simple form
can't I cumulate? can't you cumulate? can't he cumulate? can't we cumulate? can't you cumulate? can't they cumulate?
V-ing form
can't I be cumulating? can't you be cumulating? can't he be cumulating? can't we be cumulating? can't you be cumulating? can't they be cumulating?
Perfect
can't I have cumulated? can't you have cumulated? can't he have cumulated? can't we have cumulated? can't you have cumulated? can't they have cumulated?
V-ing perfect
can't I have been cumulating? can't you have been cumulating? can't he have been cumulating? can't we have been cumulating? can't you have been cumulating? can't they have been cumulating?