I can patent you can patent she can patent we can patent you can patent they can patent
V-ing form
I can be patenting you can be patenting she can be patenting we can be patenting you can be patenting they can be patenting
Perfect
I can have patented you can have patented she can have patented we can have patented you can have patented they can have patented
V-ing perfect
I can have been patenting you can have been patenting she can have been patenting we can have been patenting you can have been patenting they can have been patenting
Negation
Simple form
I can't patent you can't patent she can't patent we can't patent you can't patent they can't patent
V-ing form
I can't be patenting you can't be patenting she can't be patenting we can't be patenting you can't be patenting they can't be patenting
Perfect
I can't have patented you can't have patented she can't have patented we can't have patented you can't have patented they can't have patented
V-ing perfect
I can't have been patenting you can't have been patenting she can't have been patenting we can't have been patenting you can't have been patenting they can't have been patenting
Interrogative form
Simple form
can I patent? can you patent? can she patent? can we patent? can you patent? can they patent?
V-ing form
can I be patenting? can you be patenting? can she be patenting? can we be patenting? can you be patenting? can they be patenting?
Perfect
can I have patented? can you have patented? can she have patented? can we have patented? can you have patented? can they have patented?
V-ing perfect
can I have been patenting? can you have been patenting? can she have been patenting? can we have been patenting? can you have been patenting? can they have been patenting?
Interro-negative form
Simple form
can't I patent? can't you patent? can't she patent? can't we patent? can't you patent? can't they patent?
V-ing form
can't I be patenting? can't you be patenting? can't she be patenting? can't we be patenting? can't you be patenting? can't they be patenting?
Perfect
can't I have patented? can't you have patented? can't she have patented? can't we have patented? can't you have patented? can't they have patented?
V-ing perfect
can't I have been patenting? can't you have been patenting? can't she have been patenting? can't we have been patenting? can't you have been patenting? can't they have been patenting?