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 can't plan you can't plan he can't plan we can't plan you can't plan they can't plan	I can't be planning you can't be planning he can't be planning we can't be planning you can't be planning they can't be planning
Perfect	V-ing perfect
I can't have planned you can't have planned he can't have planned we can't have planned you can't have planned they can't have planned	I can't have been planning you can't have been planning he can't have been planning we can't have been planning you can't have been planning they can't 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't I plan? can't you plan? can't he plan? can't we plan? can't you plan? can't they plan?	can't I be planning? can't you be planning? can't he be planning? can't we be planning? can't you be planning? can't they be planning?
Perfect	V-ing perfect
can't I have planned? can't you have planned? can't he have planned? can't we have planned? can't you have planned? can't they have planned?	can't I have been planning? can't you have been planning? can't he have been planning? can't we have been planning? can't you have been planning? can't they have been planning?