should undertake
Irregular verb: undertake - undertook- undertaken

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should undertake
you should undertake
he should undertake
we should undertake
you should undertake
they should undertake 	I should be undertaking
you should be undertaking
he should be undertaking
we should be undertaking
you should be undertaking
they should be undertaking	I should have undertaken
you should have undertaken
he should have undertaken
we should have undertaken
you should have undertaken
they should have undertaken	I should have been undertaking
you should have been undertaking
he should have been undertaking
we should have been undertaking
you should have been undertaking
they should have been undertaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not undertake
you should not undertake
he should not undertake
we should not undertake
you should not undertake
they should not undertake 	I should not be undertaking
you should not be undertaking
he should not be undertaking
we should not be undertaking
you should not be undertaking
they should not be undertaking	I should not have undertaken
you should not have undertaken
he should not have undertaken
we should not have undertaken
you should not have undertaken
they should not have undertaken	I should not have been undertaking
you should not have been undertaking
he should not have been undertaking
we should not have been undertaking
you should not have been undertaking
they should not have been undertaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I undertake?
should you undertake?
should he undertake?
should we undertake?
should you undertake?
should they undertake? 	should I be undertaking?
should you be undertaking?
should he be undertaking?
should we be undertaking?
should you be undertaking?
should they be undertaking? 	should I have undertaken?
should you have undertaken?
should he have undertaken?
should we have undertaken?
should you have undertaken?
should they have undertaken? 	should I have been undertaking?
should you have been undertaking?
should he have been undertaking?
should we have been undertaking?
should you have been undertaking?
should they have been undertaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not undertake?
should you not undertake?
should he not undertake?
should we not undertake?
should you not undertake?
should they not undertake? 	should I not be undertaking?
should you not be undertaking?
should he not be undertaking?
should we not be undertaking?
should you not be undertaking?
should they not be undertaking? 	should I not have undertaken?
should you not have undertaken?
should he not have undertaken?
should we not have undertaken?
should you not have undertaken?
should they not have undertaken? 	should I not have been undertaking?
should you not have been undertaking?
should he not have been undertaking?
should we not have been undertaking?
should you not have been undertaking?
should they not have been undertaking?