could preserve
Verbo regular: preserve - preserved- preserved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could preserve
you could preserve
he could preserve
we could preserve
you could preserve
they could preserve 	I could be preserving
you could be preserving
he could be preserving
we could be preserving
you could be preserving
they could be preserving	I could have preserved
you could have preserved
he could have preserved
we could have preserved
you could have preserved
they could have preserved	I could have been preserving
you could have been preserving
he could have been preserving
we could have been preserving
you could have been preserving
they could have been preserving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not preserve
you could not preserve
he could not preserve
we could not preserve
you could not preserve
they could not preserve 	I could not be preserving
you could not be preserving
he could not be preserving
we could not be preserving
you could not be preserving
they could not be preserving	I could not have preserved
you could not have preserved
he could not have preserved
we could not have preserved
you could not have preserved
they could not have preserved	I could not have been preserving
you could not have been preserving
he could not have been preserving
we could not have been preserving
you could not have been preserving
they could not have been preserving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I preserve?
could you preserve?
could he preserve?
could we preserve?
could you preserve?
could they preserve? 	could I be preserving?
could you be preserving?
could he be preserving?
could we be preserving?
could you be preserving?
could they be preserving? 	could I have preserved?
could you have preserved?
could he have preserved?
could we have preserved?
could you have preserved?
could they have preserved? 	could I have been preserving?
could you have been preserving?
could he have been preserving?
could we have been preserving?
could you have been preserving?
could they have been preserving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not preserve?
could you not preserve?
could he not preserve?
could we not preserve?
could you not preserve?
could they not preserve? 	could I not be preserving?
could you not be preserving?
could he not be preserving?
could we not be preserving?
could you not be preserving?
could they not be preserving? 	could I not have preserved?
could you not have preserved?
could he not have preserved?
could we not have preserved?
could you not have preserved?
could they not have preserved? 	could I not have been preserving?
could you not have been preserving?
could he not have been preserving?
could we not have been preserving?
could you not have been preserving?
could they not have been preserving?