English verb conjugation
CAN START

Regular verb: start - started - started

Affirmation

Simple form	V-ing form
I can start you can start he can start we can start you can start they can start	I can be starting you can be starting he can be starting we can be starting you can be starting they can be starting
Perfect	V-ing perfect
I can have started you can have started he can have started we can have started you can have started they can have started	I can have been starting you can have been starting he can have been starting we can have been starting you can have been starting they can have been starting

Negation

Simple form	V-ing form
I can't start you can't start he can't start we can't start you can't start they can't start	I can't be starting you can't be starting he can't be starting we can't be starting you can't be starting they can't be starting
Perfect	V-ing perfect
I can't have started you can't have started he can't have started we can't have started you can't have started they can't have started	I can't have been starting you can't have been starting he can't have been starting we can't have been starting you can't have been starting they can't have been starting

Interrogative form

Simple form	V-ing form
can I start? can you start? can he start? can we start? can you start? can they start?	can I be starting? can you be starting? can he be starting? can we be starting? can you be starting? can they be starting?
Perfect	V-ing perfect
can I have started? can you have started? can he have started? can we have started? can you have started? can they have started?	can I have been starting? can you have been starting? can he have been starting? can we have been starting? can you have been starting? can they have been starting?

Interro-negative form

Simple form	V-ing form
can't I start? can't you start? can't he start? can't we start? can't you start? can't they start?	can't I be starting? can't you be starting? can't he be starting? can't we be starting? can't you be starting? can't they be starting?
Perfect	V-ing perfect
can't I have started? can't you have started? can't he have started? can't we have started? can't you have started? can't they have started?	can't I have been starting? can't you have been starting? can't he have been starting? can't we have been starting? can't you have been starting? can't they have been starting?