could skim
Verbo regular: skim - skimmed- skimmed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could skim
you could skim
he could skim
we could skim
you could skim
they could skim 	I could be skimming
you could be skimming
he could be skimming
we could be skimming
you could be skimming
they could be skimming	I could have skimmed
you could have skimmed
he could have skimmed
we could have skimmed
you could have skimmed
they could have skimmed	I could have been skimming
you could have been skimming
he could have been skimming
we could have been skimming
you could have been skimming
they could have been skimming	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not skim
you could not skim
he could not skim
we could not skim
you could not skim
they could not skim 	I could not be skimming
you could not be skimming
he could not be skimming
we could not be skimming
you could not be skimming
they could not be skimming	I could not have skimmed
you could not have skimmed
he could not have skimmed
we could not have skimmed
you could not have skimmed
they could not have skimmed	I could not have been skimming
you could not have been skimming
he could not have been skimming
we could not have been skimming
you could not have been skimming
they could not have been skimming	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I skim?
could you skim?
could he skim?
could we skim?
could you skim?
could they skim? 	could I be skimming?
could you be skimming?
could he be skimming?
could we be skimming?
could you be skimming?
could they be skimming? 	could I have skimmed?
could you have skimmed?
could he have skimmed?
could we have skimmed?
could you have skimmed?
could they have skimmed? 	could I have been skimming?
could you have been skimming?
could he have been skimming?
could we have been skimming?
could you have been skimming?
could they have been skimming? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not skim?
could you not skim?
could he not skim?
could we not skim?
could you not skim?
could they not skim? 	could I not be skimming?
could you not be skimming?
could he not be skimming?
could we not be skimming?
could you not be skimming?
could they not be skimming? 	could I not have skimmed?
could you not have skimmed?
could he not have skimmed?
could we not have skimmed?
could you not have skimmed?
could they not have skimmed? 	could I not have been skimming?
could you not have been skimming?
could he not have been skimming?
could we not have been skimming?
could you not have been skimming?
could they not have been skimming?