could switchback
Verbo regular: switchback - switchbacked- switchbacked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could switchback
you could switchback
she could switchback
we could switchback
you could switchback
they could switchback 	I could be switchbacking
you could be switchbacking
she could be switchbacking
we could be switchbacking
you could be switchbacking
they could be switchbacking	I could have switchbacked
you could have switchbacked
she could have switchbacked
we could have switchbacked
you could have switchbacked
they could have switchbacked	I could have been switchbacking
you could have been switchbacking
she could have been switchbacking
we could have been switchbacking
you could have been switchbacking
they could have been switchbacking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't switchback
you couldn't switchback
she couldn't switchback
we couldn't switchback
you couldn't switchback
they couldn't switchback 	I couldn't be switchbacking
you couldn't be switchbacking
she couldn't be switchbacking
we couldn't be switchbacking
you couldn't be switchbacking
they couldn't be switchbacking	I couldn't have switchbacked
you couldn't have switchbacked
she couldn't have switchbacked
we couldn't have switchbacked
you couldn't have switchbacked
they couldn't have switchbacked	I couldn't have been switchbacking
you couldn't have been switchbacking
she couldn't have been switchbacking
we couldn't have been switchbacking
you couldn't have been switchbacking
they couldn't have been switchbacking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I switchback?
could you switchback?
could she switchback?
could we switchback?
could you switchback?
could they switchback? 	could I be switchbacking?
could you be switchbacking?
could she be switchbacking?
could we be switchbacking?
could you be switchbacking?
could they be switchbacking? 	could I have switchbacked?
could you have switchbacked?
could she have switchbacked?
could we have switchbacked?
could you have switchbacked?
could they have switchbacked? 	could I have been switchbacking?
could you have been switchbacking?
could she have been switchbacking?
could we have been switchbacking?
could you have been switchbacking?
could they have been switchbacking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I switchback?
couldn't you switchback?
couldn't she switchback?
couldn't we switchback?
couldn't you switchback?
couldn't they switchback? 	couldn't I be switchbacking?
couldn't you be switchbacking?
couldn't she be switchbacking?
couldn't we be switchbacking?
couldn't you be switchbacking?
couldn't they be switchbacking? 	couldn't I have switchbacked?
couldn't you have switchbacked?
couldn't she have switchbacked?
couldn't we have switchbacked?
couldn't you have switchbacked?
couldn't they have switchbacked? 	couldn't I have been switchbacking?
couldn't you have been switchbacking?
couldn't she have been switchbacking?
couldn't we have been switchbacking?
couldn't you have been switchbacking?
couldn't they have been switchbacking?