could phase
Regular verb: phase - phased- phased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could phase
you could phase
he could phase
we could phase
you could phase
they could phase 	I could be phasing
you could be phasing
he could be phasing
we could be phasing
you could be phasing
they could be phasing	I could have phased
you could have phased
he could have phased
we could have phased
you could have phased
they could have phased	I could have been phasing
you could have been phasing
he could have been phasing
we could have been phasing
you could have been phasing
they could have been phasing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not phase
you could not phase
he could not phase
we could not phase
you could not phase
they could not phase 	I could not be phasing
you could not be phasing
he could not be phasing
we could not be phasing
you could not be phasing
they could not be phasing	I could not have phased
you could not have phased
he could not have phased
we could not have phased
you could not have phased
they could not have phased	I could not have been phasing
you could not have been phasing
he could not have been phasing
we could not have been phasing
you could not have been phasing
they could not have been phasing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I phase?
could you phase?
could he phase?
could we phase?
could you phase?
could they phase? 	could I be phasing?
could you be phasing?
could he be phasing?
could we be phasing?
could you be phasing?
could they be phasing? 	could I have phased?
could you have phased?
could he have phased?
could we have phased?
could you have phased?
could they have phased? 	could I have been phasing?
could you have been phasing?
could he have been phasing?
could we have been phasing?
could you have been phasing?
could they have been phasing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not phase?
could you not phase?
could he not phase?
could we not phase?
could you not phase?
could they not phase? 	could I not be phasing?
could you not be phasing?
could he not be phasing?
could we not be phasing?
could you not be phasing?
could they not be phasing? 	could I not have phased?
could you not have phased?
could he not have phased?
could we not have phased?
could you not have phased?
could they not have phased? 	could I not have been phasing?
could you not have been phasing?
could he not have been phasing?
could we not have been phasing?
could you not have been phasing?
could they not have been phasing?