could assess
Regular verb: assess - assessed- assessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could assess
you could assess
she could assess
we could assess
you could assess
they could assess 	I could be assessing
you could be assessing
she could be assessing
we could be assessing
you could be assessing
they could be assessing	I could have assessed
you could have assessed
she could have assessed
we could have assessed
you could have assessed
they could have assessed	I could have been assessing
you could have been assessing
she could have been assessing
we could have been assessing
you could have been assessing
they could have been assessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't assess
you couldn't assess
she couldn't assess
we couldn't assess
you couldn't assess
they couldn't assess 	I couldn't be assessing
you couldn't be assessing
she couldn't be assessing
we couldn't be assessing
you couldn't be assessing
they couldn't be assessing	I couldn't have assessed
you couldn't have assessed
she couldn't have assessed
we couldn't have assessed
you couldn't have assessed
they couldn't have assessed	I couldn't have been assessing
you couldn't have been assessing
she couldn't have been assessing
we couldn't have been assessing
you couldn't have been assessing
they couldn't have been assessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I assess?
could you assess?
could she assess?
could we assess?
could you assess?
could they assess? 	could I be assessing?
could you be assessing?
could she be assessing?
could we be assessing?
could you be assessing?
could they be assessing? 	could I have assessed?
could you have assessed?
could she have assessed?
could we have assessed?
could you have assessed?
could they have assessed? 	could I have been assessing?
could you have been assessing?
could she have been assessing?
could we have been assessing?
could you have been assessing?
could they have been assessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I assess?
couldn't you assess?
couldn't she assess?
couldn't we assess?
couldn't you assess?
couldn't they assess? 	couldn't I be assessing?
couldn't you be assessing?
couldn't she be assessing?
couldn't we be assessing?
couldn't you be assessing?
couldn't they be assessing? 	couldn't I have assessed?
couldn't you have assessed?
couldn't she have assessed?
couldn't we have assessed?
couldn't you have assessed?
couldn't they have assessed? 	couldn't I have been assessing?
couldn't you have been assessing?
couldn't she have been assessing?
couldn't we have been assessing?
couldn't you have been assessing?
couldn't they have been assessing?