I can endorse you can endorse he can endorse we can endorse you can endorse they can endorse
V-ing form
I can be endorsing you can be endorsing he can be endorsing we can be endorsing you can be endorsing they can be endorsing
Perfect
I can have endorsed you can have endorsed he can have endorsed we can have endorsed you can have endorsed they can have endorsed
V-ing perfect
I can have been endorsing you can have been endorsing he can have been endorsing we can have been endorsing you can have been endorsing they can have been endorsing
Negation
Simple form
I can't endorse you can't endorse he can't endorse we can't endorse you can't endorse they can't endorse
V-ing form
I can't be endorsing you can't be endorsing he can't be endorsing we can't be endorsing you can't be endorsing they can't be endorsing
Perfect
I can't have endorsed you can't have endorsed he can't have endorsed we can't have endorsed you can't have endorsed they can't have endorsed
V-ing perfect
I can't have been endorsing you can't have been endorsing he can't have been endorsing we can't have been endorsing you can't have been endorsing they can't have been endorsing
Interrogative form
Simple form
can I endorse? can you endorse? can he endorse? can we endorse? can you endorse? can they endorse?
V-ing form
can I be endorsing? can you be endorsing? can he be endorsing? can we be endorsing? can you be endorsing? can they be endorsing?
Perfect
can I have endorsed? can you have endorsed? can he have endorsed? can we have endorsed? can you have endorsed? can they have endorsed?
V-ing perfect
can I have been endorsing? can you have been endorsing? can he have been endorsing? can we have been endorsing? can you have been endorsing? can they have been endorsing?
Interro-negative form
Simple form
can't I endorse? can't you endorse? can't he endorse? can't we endorse? can't you endorse? can't they endorse?
V-ing form
can't I be endorsing? can't you be endorsing? can't he be endorsing? can't we be endorsing? can't you be endorsing? can't they be endorsing?
Perfect
can't I have endorsed? can't you have endorsed? can't he have endorsed? can't we have endorsed? can't you have endorsed? can't they have endorsed?
V-ing perfect
can't I have been endorsing? can't you have been endorsing? can't he have been endorsing? can't we have been endorsing? can't you have been endorsing? can't they have been endorsing?