I can assess you can assess he can assess we can assess you can assess they can assess
V-ing form
I can be assessing you can be assessing he can be assessing we can be assessing you can be assessing they can be assessing
Perfect
I can have assessed you can have assessed he can have assessed we can have assessed you can have assessed they can have assessed
V-ing perfect
I can have been assessing you can have been assessing he can have been assessing we can have been assessing you can have been assessing they can have been assessing
Negation
Simple form
I can't assess you can't assess he can't assess we can't assess you can't assess they can't assess
V-ing form
I can't be assessing you can't be assessing he can't be assessing we can't be assessing you can't be assessing they can't be assessing
Perfect
I can't have assessed you can't have assessed he can't have assessed we can't have assessed you can't have assessed they can't have assessed
V-ing perfect
I can't have been assessing you can't have been assessing he can't have been assessing we can't have been assessing you can't have been assessing they can't have been assessing
Interrogative form
Simple form
can I assess? can you assess? can he assess? can we assess? can you assess? can they assess?
V-ing form
can I be assessing? can you be assessing? can he be assessing? can we be assessing? can you be assessing? can they be assessing?
Perfect
can I have assessed? can you have assessed? can he have assessed? can we have assessed? can you have assessed? can they have assessed?
V-ing perfect
can I have been assessing? can you have been assessing? can he have been assessing? can we have been assessing? can you have been assessing? can they have been assessing?
Interro-negative form
Simple form
can't I assess? can't you assess? can't he assess? can't we assess? can't you assess? can't they assess?
V-ing form
can't I be assessing? can't you be assessing? can't he be assessing? can't we be assessing? can't you be assessing? can't they be assessing?
Perfect
can't I have assessed? can't you have assessed? can't he have assessed? can't we have assessed? can't you have assessed? can't they have assessed?
V-ing perfect
can't I have been assessing? can't you have been assessing? can't he have been assessing? can't we have been assessing? can't you have been assessing? can't they have been assessing?