could fossilise
Verbo regular: fossilise - fossilised- fossilised

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could fossilise
you could fossilise
he could fossilise
we could fossilise
you could fossilise
they could fossilise 	I could be fossilising
you could be fossilising
he could be fossilising
we could be fossilising
you could be fossilising
they could be fossilising	I could have fossilised
you could have fossilised
he could have fossilised
we could have fossilised
you could have fossilised
they could have fossilised	I could have been fossilising
you could have been fossilising
he could have been fossilising
we could have been fossilising
you could have been fossilising
they could have been fossilising	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not fossilise
you could not fossilise
he could not fossilise
we could not fossilise
you could not fossilise
they could not fossilise 	I could not be fossilising
you could not be fossilising
he could not be fossilising
we could not be fossilising
you could not be fossilising
they could not be fossilising	I could not have fossilised
you could not have fossilised
he could not have fossilised
we could not have fossilised
you could not have fossilised
they could not have fossilised	I could not have been fossilising
you could not have been fossilising
he could not have been fossilising
we could not have been fossilising
you could not have been fossilising
they could not have been fossilising	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I fossilise?
could you fossilise?
could he fossilise?
could we fossilise?
could you fossilise?
could they fossilise? 	could I be fossilising?
could you be fossilising?
could he be fossilising?
could we be fossilising?
could you be fossilising?
could they be fossilising? 	could I have fossilised?
could you have fossilised?
could he have fossilised?
could we have fossilised?
could you have fossilised?
could they have fossilised? 	could I have been fossilising?
could you have been fossilising?
could he have been fossilising?
could we have been fossilising?
could you have been fossilising?
could they have been fossilising? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not fossilise?
could you not fossilise?
could he not fossilise?
could we not fossilise?
could you not fossilise?
could they not fossilise? 	could I not be fossilising?
could you not be fossilising?
could he not be fossilising?
could we not be fossilising?
could you not be fossilising?
could they not be fossilising? 	could I not have fossilised?
could you not have fossilised?
could he not have fossilised?
could we not have fossilised?
could you not have fossilised?
could they not have fossilised? 	could I not have been fossilising?
could you not have been fossilising?
could he not have been fossilising?
could we not have been fossilising?
could you not have been fossilising?
could they not have been fossilising?