could phosphorylate
Regular verb: phosphorylate - phosphorylated- phosphorylated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could phosphorylate
you could phosphorylate
he could phosphorylate
we could phosphorylate
you could phosphorylate
they could phosphorylate 	I could be phosphorylating
you could be phosphorylating
he could be phosphorylating
we could be phosphorylating
you could be phosphorylating
they could be phosphorylating	I could have phosphorylated
you could have phosphorylated
he could have phosphorylated
we could have phosphorylated
you could have phosphorylated
they could have phosphorylated	I could have been phosphorylating
you could have been phosphorylating
he could have been phosphorylating
we could have been phosphorylating
you could have been phosphorylating
they could have been phosphorylating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't phosphorylate
you couldn't phosphorylate
he couldn't phosphorylate
we couldn't phosphorylate
you couldn't phosphorylate
they couldn't phosphorylate 	I couldn't be phosphorylating
you couldn't be phosphorylating
he couldn't be phosphorylating
we couldn't be phosphorylating
you couldn't be phosphorylating
they couldn't be phosphorylating	I couldn't have phosphorylated
you couldn't have phosphorylated
he couldn't have phosphorylated
we couldn't have phosphorylated
you couldn't have phosphorylated
they couldn't have phosphorylated	I couldn't have been phosphorylating
you couldn't have been phosphorylating
he couldn't have been phosphorylating
we couldn't have been phosphorylating
you couldn't have been phosphorylating
they couldn't have been phosphorylating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I phosphorylate?
could you phosphorylate?
could he phosphorylate?
could we phosphorylate?
could you phosphorylate?
could they phosphorylate? 	could I be phosphorylating?
could you be phosphorylating?
could he be phosphorylating?
could we be phosphorylating?
could you be phosphorylating?
could they be phosphorylating? 	could I have phosphorylated?
could you have phosphorylated?
could he have phosphorylated?
could we have phosphorylated?
could you have phosphorylated?
could they have phosphorylated? 	could I have been phosphorylating?
could you have been phosphorylating?
could he have been phosphorylating?
could we have been phosphorylating?
could you have been phosphorylating?
could they have been phosphorylating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I phosphorylate?
couldn't you phosphorylate?
couldn't he phosphorylate?
couldn't we phosphorylate?
couldn't you phosphorylate?
couldn't they phosphorylate? 	couldn't I be phosphorylating?
couldn't you be phosphorylating?
couldn't he be phosphorylating?
couldn't we be phosphorylating?
couldn't you be phosphorylating?
couldn't they be phosphorylating? 	couldn't I have phosphorylated?
couldn't you have phosphorylated?
couldn't he have phosphorylated?
couldn't we have phosphorylated?
couldn't you have phosphorylated?
couldn't they have phosphorylated? 	couldn't I have been phosphorylating?
couldn't you have been phosphorylating?
couldn't he have been phosphorylating?
couldn't we have been phosphorylating?
couldn't you have been phosphorylating?
couldn't they have been phosphorylating?