I can assert you can assert she can assert we can assert you can assert they can assert
V-ing form
I can be asserting you can be asserting she can be asserting we can be asserting you can be asserting they can be asserting
Perfect
I can have asserted you can have asserted she can have asserted we can have asserted you can have asserted they can have asserted
V-ing perfect
I can have been asserting you can have been asserting she can have been asserting we can have been asserting you can have been asserting they can have been asserting
Negation
Simple form
I can't assert you can't assert she can't assert we can't assert you can't assert they can't assert
V-ing form
I can't be asserting you can't be asserting she can't be asserting we can't be asserting you can't be asserting they can't be asserting
Perfect
I can't have asserted you can't have asserted she can't have asserted we can't have asserted you can't have asserted they can't have asserted
V-ing perfect
I can't have been asserting you can't have been asserting she can't have been asserting we can't have been asserting you can't have been asserting they can't have been asserting
Interrogative form
Simple form
can I assert? can you assert? can she assert? can we assert? can you assert? can they assert?
V-ing form
can I be asserting? can you be asserting? can she be asserting? can we be asserting? can you be asserting? can they be asserting?
Perfect
can I have asserted? can you have asserted? can she have asserted? can we have asserted? can you have asserted? can they have asserted?
V-ing perfect
can I have been asserting? can you have been asserting? can she have been asserting? can we have been asserting? can you have been asserting? can they have been asserting?
Interro-negative form
Simple form
can't I assert? can't you assert? can't she assert? can't we assert? can't you assert? can't they assert?
V-ing form
can't I be asserting? can't you be asserting? can't she be asserting? can't we be asserting? can't you be asserting? can't they be asserting?
Perfect
can't I have asserted? can't you have asserted? can't she have asserted? can't we have asserted? can't you have asserted? can't they have asserted?
V-ing perfect
can't I have been asserting? can't you have been asserting? can't she have been asserting? can't we have been asserting? can't you have been asserting? can't they have been asserting?