could refrigerate
Regular verb: refrigerate - refrigerated- refrigerated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could refrigerate
you could refrigerate
he could refrigerate
we could refrigerate
you could refrigerate
they could refrigerate 	I could be refrigerating
you could be refrigerating
he could be refrigerating
we could be refrigerating
you could be refrigerating
they could be refrigerating	I could have refrigerated
you could have refrigerated
he could have refrigerated
we could have refrigerated
you could have refrigerated
they could have refrigerated	I could have been refrigerating
you could have been refrigerating
he could have been refrigerating
we could have been refrigerating
you could have been refrigerating
they could have been refrigerating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't refrigerate
you couldn't refrigerate
he couldn't refrigerate
we couldn't refrigerate
you couldn't refrigerate
they couldn't refrigerate 	I couldn't be refrigerating
you couldn't be refrigerating
he couldn't be refrigerating
we couldn't be refrigerating
you couldn't be refrigerating
they couldn't be refrigerating	I couldn't have refrigerated
you couldn't have refrigerated
he couldn't have refrigerated
we couldn't have refrigerated
you couldn't have refrigerated
they couldn't have refrigerated	I couldn't have been refrigerating
you couldn't have been refrigerating
he couldn't have been refrigerating
we couldn't have been refrigerating
you couldn't have been refrigerating
they couldn't have been refrigerating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I refrigerate?
could you refrigerate?
could he refrigerate?
could we refrigerate?
could you refrigerate?
could they refrigerate? 	could I be refrigerating?
could you be refrigerating?
could he be refrigerating?
could we be refrigerating?
could you be refrigerating?
could they be refrigerating? 	could I have refrigerated?
could you have refrigerated?
could he have refrigerated?
could we have refrigerated?
could you have refrigerated?
could they have refrigerated? 	could I have been refrigerating?
could you have been refrigerating?
could he have been refrigerating?
could we have been refrigerating?
could you have been refrigerating?
could they have been refrigerating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I refrigerate?
couldn't you refrigerate?
couldn't he refrigerate?
couldn't we refrigerate?
couldn't you refrigerate?
couldn't they refrigerate? 	couldn't I be refrigerating?
couldn't you be refrigerating?
couldn't he be refrigerating?
couldn't we be refrigerating?
couldn't you be refrigerating?
couldn't they be refrigerating? 	couldn't I have refrigerated?
couldn't you have refrigerated?
couldn't he have refrigerated?
couldn't we have refrigerated?
couldn't you have refrigerated?
couldn't they have refrigerated? 	couldn't I have been refrigerating?
couldn't you have been refrigerating?
couldn't he have been refrigerating?
couldn't we have been refrigerating?
couldn't you have been refrigerating?
couldn't they have been refrigerating?