English verb conjugation
CAN COMMENCE

Regular verb: commence - commenced - commenced

Affirmation

Simple form	V-ing form
I can commence you can commence she can commence we can commence you can commence they can commence	I can be commencing you can be commencing she can be commencing we can be commencing you can be commencing they can be commencing
Perfect	V-ing perfect
I can have commenced you can have commenced she can have commenced we can have commenced you can have commenced they can have commenced	I can have been commencing you can have been commencing she can have been commencing we can have been commencing you can have been commencing they can have been commencing

Negation

Simple form	V-ing form
I cannot commence you cannot commence she cannot commence we cannot commence you cannot commence they cannot commence	I cannot be commencing you cannot be commencing she cannot be commencing we cannot be commencing you cannot be commencing they cannot be commencing
Perfect	V-ing perfect
I cannot have commenced you cannot have commenced she cannot have commenced we cannot have commenced you cannot have commenced they cannot have commenced	I cannot have been commencing you cannot have been commencing she cannot have been commencing we cannot have been commencing you cannot have been commencing they cannot have been commencing

Interrogative form

Simple form	V-ing form
can I commence? can you commence? can she commence? can we commence? can you commence? can they commence?	can I be commencing? can you be commencing? can she be commencing? can we be commencing? can you be commencing? can they be commencing?
Perfect	V-ing perfect
can I have commenced? can you have commenced? can she have commenced? can we have commenced? can you have commenced? can they have commenced?	can I have been commencing? can you have been commencing? can she have been commencing? can we have been commencing? can you have been commencing? can they have been commencing?

Interro-negative form

Simple form	V-ing form
can I not commence? can you not commence? can she not commence? can we not commence? can you not commence? can they not commence?	can I not be commencing? can you not be commencing? can she not be commencing? can we not be commencing? can you not be commencing? can they not be commencing?
Perfect	V-ing perfect
can I not have commenced? can you not have commenced? can she not have commenced? can we not have commenced? can you not have commenced? can they not have commenced?	can I not have been commencing? can you not have been commencing? can she not have been commencing? can we not have been commencing? can you not have been commencing? can they not have been commencing?