English verb conjugation
CAN UNDERTAKE

Irregular verb: undertake - undertook - undertaken

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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