could curdle
Regular verb: curdle - curdled- curdled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could curdle
you could curdle
she could curdle
we could curdle
you could curdle
they could curdle 	I could be curdling
you could be curdling
she could be curdling
we could be curdling
you could be curdling
they could be curdling	I could have curdled
you could have curdled
she could have curdled
we could have curdled
you could have curdled
they could have curdled	I could have been curdling
you could have been curdling
she could have been curdling
we could have been curdling
you could have been curdling
they could have been curdling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not curdle
you could not curdle
she could not curdle
we could not curdle
you could not curdle
they could not curdle 	I could not be curdling
you could not be curdling
she could not be curdling
we could not be curdling
you could not be curdling
they could not be curdling	I could not have curdled
you could not have curdled
she could not have curdled
we could not have curdled
you could not have curdled
they could not have curdled	I could not have been curdling
you could not have been curdling
she could not have been curdling
we could not have been curdling
you could not have been curdling
they could not have been curdling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I curdle?
could you curdle?
could she curdle?
could we curdle?
could you curdle?
could they curdle? 	could I be curdling?
could you be curdling?
could she be curdling?
could we be curdling?
could you be curdling?
could they be curdling? 	could I have curdled?
could you have curdled?
could she have curdled?
could we have curdled?
could you have curdled?
could they have curdled? 	could I have been curdling?
could you have been curdling?
could she have been curdling?
could we have been curdling?
could you have been curdling?
could they have been curdling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not curdle?
could you not curdle?
could she not curdle?
could we not curdle?
could you not curdle?
could they not curdle? 	could I not be curdling?
could you not be curdling?
could she not be curdling?
could we not be curdling?
could you not be curdling?
could they not be curdling? 	could I not have curdled?
could you not have curdled?
could she not have curdled?
could we not have curdled?
could you not have curdled?
could they not have curdled? 	could I not have been curdling?
could you not have been curdling?
could she not have been curdling?
could we not have been curdling?
could you not have been curdling?
could they not have been curdling?