could start
Verbo regular: start - started- started

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could start
you could start
he could start
we could start
you could start
they could start 	I could be starting
you could be starting
he could be starting
we could be starting
you could be starting
they could be starting	I could have started
you could have started
he could have started
we could have started
you could have started
they could have started	I could have been starting
you could have been starting
he could have been starting
we could have been starting
you could have been starting
they could have been starting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't start
you couldn't start
he couldn't start
we couldn't start
you couldn't start
they couldn't start 	I couldn't be starting
you couldn't be starting
he couldn't be starting
we couldn't be starting
you couldn't be starting
they couldn't be starting	I couldn't have started
you couldn't have started
he couldn't have started
we couldn't have started
you couldn't have started
they couldn't have started	I couldn't have been starting
you couldn't have been starting
he couldn't have been starting
we couldn't have been starting
you couldn't have been starting
they couldn't have been starting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I start?
could you start?
could he start?
could we start?
could you start?
could they start? 	could I be starting?
could you be starting?
could he be starting?
could we be starting?
could you be starting?
could they be starting? 	could I have started?
could you have started?
could he have started?
could we have started?
could you have started?
could they have started? 	could I have been starting?
could you have been starting?
could he have been starting?
could we have been starting?
could you have been starting?
could they have been starting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I start?
couldn't you start?
couldn't he start?
couldn't we start?
couldn't you start?
couldn't they start? 	couldn't I be starting?
couldn't you be starting?
couldn't he be starting?
couldn't we be starting?
couldn't you be starting?
couldn't they be starting? 	couldn't I have started?
couldn't you have started?
couldn't he have started?
couldn't we have started?
couldn't you have started?
couldn't they have started? 	couldn't I have been starting?
couldn't you have been starting?
couldn't he have been starting?
couldn't we have been starting?
couldn't you have been starting?
couldn't they have been starting?