I'd be understanding you'd be understanding she'd be understanding we'd be understanding you'd be understanding they'd be understanding
Perfect
I would've understood you would've understood she would've understood we would've understood you would've understood they would've understood
V-ing perfect
I would've been understanding you would've been understanding she would've been understanding we would've been understanding you would've been understanding they would've been understanding
Negation
Simple form
I wouldn't understand you wouldn't understand she wouldn't understand we wouldn't understand you wouldn't understand they wouldn't understand
V-ing form
I wouldn't be understanding you wouldn't be understanding she wouldn't be understanding we wouldn't be understanding you wouldn't be understanding they wouldn't be understanding
Perfect
I wouldn't have understood you wouldn't have understood she wouldn't have understood we wouldn't have understood you wouldn't have understood they wouldn't have understood
V-ing perfect
I wouldn't have been understanding you wouldn't have been understanding she wouldn't have been understanding we wouldn't have been understanding you wouldn't have been understanding they wouldn't have been understanding
Interrogative form
Simple form
would I understand? would you understand? would she understand? would we understand? would you understand? would they understand?
V-ing form
would I be understanding? would you be understanding? would she be understanding? would we be understanding? would you be understanding? would they be understanding?
Perfect
would I have understood? would you have understood? would she have understood? would we have understood? would you have understood? would they have understood?
V-ing perfect
would I have been understanding? would you have been understanding? would she have been understanding? would we have been understanding? would you have been understanding? would they have been understanding?
Interro-negative form
Simple form
wouldn't I understand? wouldn't you understand? wouldn't she understand? wouldn't we understand? wouldn't you understand? wouldn't they understand?
V-ing form
wouldn't I be understanding? wouldn't you be understanding? wouldn't she be understanding? wouldn't we be understanding? wouldn't you be understanding? wouldn't they be understanding?
Perfect
wouldn't I have understood? wouldn't you have understood? wouldn't she have understood? wouldn't we have understood? wouldn't you have understood? wouldn't they have understood?
V-ing perfect
wouldn't I have been understanding? wouldn't you have been understanding? wouldn't she have been understanding? wouldn't we have been understanding? wouldn't you have been understanding? wouldn't they have been understanding?