could dilute
Regular verb: dilute - diluted- diluted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dilute
you could dilute
she could dilute
we could dilute
you could dilute
they could dilute 	I could be diluting
you could be diluting
she could be diluting
we could be diluting
you could be diluting
they could be diluting	I could have diluted
you could have diluted
she could have diluted
we could have diluted
you could have diluted
they could have diluted	I could have been diluting
you could have been diluting
she could have been diluting
we could have been diluting
you could have been diluting
they could have been diluting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't dilute
you couldn't dilute
she couldn't dilute
we couldn't dilute
you couldn't dilute
they couldn't dilute 	I couldn't be diluting
you couldn't be diluting
she couldn't be diluting
we couldn't be diluting
you couldn't be diluting
they couldn't be diluting	I couldn't have diluted
you couldn't have diluted
she couldn't have diluted
we couldn't have diluted
you couldn't have diluted
they couldn't have diluted	I couldn't have been diluting
you couldn't have been diluting
she couldn't have been diluting
we couldn't have been diluting
you couldn't have been diluting
they couldn't have been diluting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dilute?
could you dilute?
could she dilute?
could we dilute?
could you dilute?
could they dilute? 	could I be diluting?
could you be diluting?
could she be diluting?
could we be diluting?
could you be diluting?
could they be diluting? 	could I have diluted?
could you have diluted?
could she have diluted?
could we have diluted?
could you have diluted?
could they have diluted? 	could I have been diluting?
could you have been diluting?
could she have been diluting?
could we have been diluting?
could you have been diluting?
could they have been diluting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I dilute?
couldn't you dilute?
couldn't she dilute?
couldn't we dilute?
couldn't you dilute?
couldn't they dilute? 	couldn't I be diluting?
couldn't you be diluting?
couldn't she be diluting?
couldn't we be diluting?
couldn't you be diluting?
couldn't they be diluting? 	couldn't I have diluted?
couldn't you have diluted?
couldn't she have diluted?
couldn't we have diluted?
couldn't you have diluted?
couldn't they have diluted? 	couldn't I have been diluting?
couldn't you have been diluting?
couldn't she have been diluting?
couldn't we have been diluting?
couldn't you have been diluting?
couldn't they have been diluting?