I could arch you could arch she could arch we could arch you could arch they could arch
Forma com V-ing
I could be arching you could be arching she could be arching we could be arching you could be arching they could be arching
Perfeito
I could have arched you could have arched she could have arched we could have arched you could have arched they could have arched
Perfeito com V-ing
I could have been arching you could have been arching she could have been arching we could have been arching you could have been arching they could have been arching
Negação
Forma simple
I could not arch you could not arch she could not arch we could not arch you could not arch they could not arch
Forma com V-ing
I could not be arching you could not be arching she could not be arching we could not be arching you could not be arching they could not be arching
Perfeito
I could not have arched you could not have arched she could not have arched we could not have arched you could not have arched they could not have arched
Perfeito com V-ing
I could not have been arching you could not have been arching she could not have been arching we could not have been arching you could not have been arching they could not have been arching
Forma interrogativa
Forma simple
could I arch? could you arch? could she arch? could we arch? could you arch? could they arch?
Forma com V-ing
could I be arching? could you be arching? could she be arching? could we be arching? could you be arching? could they be arching?
Perfeito
could I have arched? could you have arched? could she have arched? could we have arched? could you have arched? could they have arched?
Perfeito com V-ing
could I have been arching? could you have been arching? could she have been arching? could we have been arching? could you have been arching? could they have been arching?
Forma interro-Negação
Forma simple
could I not arch? could you not arch? could she not arch? could we not arch? could you not arch? could they not arch?
Forma com V-ing
could I not be arching? could you not be arching? could she not be arching? could we not be arching? could you not be arching? could they not be arching?
Perfeito
could I not have arched? could you not have arched? could she not have arched? could we not have arched? could you not have arched? could they not have arched?
Perfeito com V-ing
could I not have been arching? could you not have been arching? could she not have been arching? could we not have been arching? could you not have been arching? could they not have been arching?