English verb conjugation
SHOULD UNDERSTAND

Irregular verb: understand - understood - understood

Affirmation

Simple form	V-ing form
I should understand you should understand he should understand we should understand you should understand they should understand	I should be understanding you should be understanding he should be understanding we should be understanding you should be understanding they should be understanding
Perfect	V-ing perfect
I should have understood you should have understood he should have understood we should have understood you should have understood they should have understood	I should have been understanding you should have been understanding he should have been understanding we should have been understanding you should have been understanding they should have been understanding

Negation

Simple form	V-ing form
I should not understand you should not understand he should not understand we should not understand you should not understand they should not understand	I should not be understanding you should not be understanding he should not be understanding we should not be understanding you should not be understanding they should not be understanding
Perfect	V-ing perfect
I should not have understood you should not have understood he should not have understood we should not have understood you should not have understood they should not have understood	I should not have been understanding you should not have been understanding he should not have been understanding we should not have been understanding you should not have been understanding they should not have been understanding

Interrogative form

Simple form	V-ing form
should I understand? should you understand? should he understand? should we understand? should you understand? should they understand?	should I be understanding? should you be understanding? should he be understanding? should we be understanding? should you be understanding? should they be understanding?
Perfect	V-ing perfect
should I have understood? should you have understood? should he have understood? should we have understood? should you have understood? should they have understood?	should I have been understanding? should you have been understanding? should he have been understanding? should we have been understanding? should you have been understanding? should they have been understanding?

Interro-negative form

Simple form	V-ing form
should I not understand? should you not understand? should he not understand? should we not understand? should you not understand? should they not understand?	should I not be understanding? should you not be understanding? should he not be understanding? should we not be understanding? should you not be understanding? should they not be understanding?
Perfect	V-ing perfect
should I not have understood? should you not have understood? should he not have understood? should we not have understood? should you not have understood? should they not have understood?	should I not have been understanding? should you not have been understanding? should he not have been understanding? should we not have been understanding? should you not have been understanding? should they not have been understanding?