could diffract
Verbo regular: diffract - diffracted- diffracted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could diffract
you could diffract
he could diffract
we could diffract
you could diffract
they could diffract 	I could be diffracting
you could be diffracting
he could be diffracting
we could be diffracting
you could be diffracting
they could be diffracting	I could have diffracted
you could have diffracted
he could have diffracted
we could have diffracted
you could have diffracted
they could have diffracted	I could have been diffracting
you could have been diffracting
he could have been diffracting
we could have been diffracting
you could have been diffracting
they could have been diffracting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't diffract
you couldn't diffract
he couldn't diffract
we couldn't diffract
you couldn't diffract
they couldn't diffract 	I couldn't be diffracting
you couldn't be diffracting
he couldn't be diffracting
we couldn't be diffracting
you couldn't be diffracting
they couldn't be diffracting	I couldn't have diffracted
you couldn't have diffracted
he couldn't have diffracted
we couldn't have diffracted
you couldn't have diffracted
they couldn't have diffracted	I couldn't have been diffracting
you couldn't have been diffracting
he couldn't have been diffracting
we couldn't have been diffracting
you couldn't have been diffracting
they couldn't have been diffracting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I diffract?
could you diffract?
could he diffract?
could we diffract?
could you diffract?
could they diffract? 	could I be diffracting?
could you be diffracting?
could he be diffracting?
could we be diffracting?
could you be diffracting?
could they be diffracting? 	could I have diffracted?
could you have diffracted?
could he have diffracted?
could we have diffracted?
could you have diffracted?
could they have diffracted? 	could I have been diffracting?
could you have been diffracting?
could he have been diffracting?
could we have been diffracting?
could you have been diffracting?
could they have been diffracting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I diffract?
couldn't you diffract?
couldn't he diffract?
couldn't we diffract?
couldn't you diffract?
couldn't they diffract? 	couldn't I be diffracting?
couldn't you be diffracting?
couldn't he be diffracting?
couldn't we be diffracting?
couldn't you be diffracting?
couldn't they be diffracting? 	couldn't I have diffracted?
couldn't you have diffracted?
couldn't he have diffracted?
couldn't we have diffracted?
couldn't you have diffracted?
couldn't they have diffracted? 	couldn't I have been diffracting?
couldn't you have been diffracting?
couldn't he have been diffracting?
couldn't we have been diffracting?
couldn't you have been diffracting?
couldn't they have been diffracting?