can start
Regular verb: start - started- started

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?