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 cannot assess you cannot assess he cannot assess we cannot assess you cannot assess they cannot assess
V-ing form
I cannot be assessing you cannot be assessing he cannot be assessing we cannot be assessing you cannot be assessing they cannot be assessing
Perfect
I cannot have assessed you cannot have assessed he cannot have assessed we cannot have assessed you cannot have assessed they cannot have assessed
V-ing perfect
I cannot have been assessing you cannot have been assessing he cannot have been assessing we cannot have been assessing you cannot have been assessing they cannot 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 I not assess? can you not assess? can he not assess? can we not assess? can you not assess? can they not assess?
V-ing form
can I not be assessing? can you not be assessing? can he not be assessing? can we not be assessing? can you not be assessing? can they not be assessing?
Perfect
can I not have assessed? can you not have assessed? can he not have assessed? can we not have assessed? can you not have assessed? can they not have assessed?
V-ing perfect
can I not have been assessing? can you not have been assessing? can he not have been assessing? can we not have been assessing? can you not have been assessing? can they not have been assessing?