English verb conjugation
CAN PLAN

Regular verb: plan - planned - planned

Affirmation

Simple form	V-ing form
I can plan you can plan he can plan we can plan you can plan they can plan	I can be planning you can be planning he can be planning we can be planning you can be planning they can be planning
Perfect	V-ing perfect
I can have planned you can have planned he can have planned we can have planned you can have planned they can have planned	I can have been planning you can have been planning he can have been planning we can have been planning you can have been planning they can have been planning

Negation

Simple form	V-ing form
I cannot plan you cannot plan he cannot plan we cannot plan you cannot plan they cannot plan	I cannot be planning you cannot be planning he cannot be planning we cannot be planning you cannot be planning they cannot be planning
Perfect	V-ing perfect
I cannot have planned you cannot have planned he cannot have planned we cannot have planned you cannot have planned they cannot have planned	I cannot have been planning you cannot have been planning he cannot have been planning we cannot have been planning you cannot have been planning they cannot have been planning

Interrogative form

Simple form	V-ing form
can I plan? can you plan? can he plan? can we plan? can you plan? can they plan?	can I be planning? can you be planning? can he be planning? can we be planning? can you be planning? can they be planning?
Perfect	V-ing perfect
can I have planned? can you have planned? can he have planned? can we have planned? can you have planned? can they have planned?	can I have been planning? can you have been planning? can he have been planning? can we have been planning? can you have been planning? can they have been planning?

Interro-negative form

Simple form	V-ing form
can I not plan? can you not plan? can he not plan? can we not plan? can you not plan? can they not plan?	can I not be planning? can you not be planning? can he not be planning? can we not be planning? can you not be planning? can they not be planning?
Perfect	V-ing perfect
can I not have planned? can you not have planned? can he not have planned? can we not have planned? can you not have planned? can they not have planned?	can I not have been planning? can you not have been planning? can he not have been planning? can we not have been planning? can you not have been planning? can they not have been planning?