could encyst
Regular verb: encyst - encysted- encysted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could encyst
you could encyst
he could encyst
we could encyst
you could encyst
they could encyst 	I could be encysting
you could be encysting
he could be encysting
we could be encysting
you could be encysting
they could be encysting	I could have encysted
you could have encysted
he could have encysted
we could have encysted
you could have encysted
they could have encysted	I could have been encysting
you could have been encysting
he could have been encysting
we could have been encysting
you could have been encysting
they could have been encysting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't encyst
you couldn't encyst
he couldn't encyst
we couldn't encyst
you couldn't encyst
they couldn't encyst 	I couldn't be encysting
you couldn't be encysting
he couldn't be encysting
we couldn't be encysting
you couldn't be encysting
they couldn't be encysting	I couldn't have encysted
you couldn't have encysted
he couldn't have encysted
we couldn't have encysted
you couldn't have encysted
they couldn't have encysted	I couldn't have been encysting
you couldn't have been encysting
he couldn't have been encysting
we couldn't have been encysting
you couldn't have been encysting
they couldn't have been encysting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I encyst?
could you encyst?
could he encyst?
could we encyst?
could you encyst?
could they encyst? 	could I be encysting?
could you be encysting?
could he be encysting?
could we be encysting?
could you be encysting?
could they be encysting? 	could I have encysted?
could you have encysted?
could he have encysted?
could we have encysted?
could you have encysted?
could they have encysted? 	could I have been encysting?
could you have been encysting?
could he have been encysting?
could we have been encysting?
could you have been encysting?
could they have been encysting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I encyst?
couldn't you encyst?
couldn't he encyst?
couldn't we encyst?
couldn't you encyst?
couldn't they encyst? 	couldn't I be encysting?
couldn't you be encysting?
couldn't he be encysting?
couldn't we be encysting?
couldn't you be encysting?
couldn't they be encysting? 	couldn't I have encysted?
couldn't you have encysted?
couldn't he have encysted?
couldn't we have encysted?
couldn't you have encysted?
couldn't they have encysted? 	couldn't I have been encysting?
couldn't you have been encysting?
couldn't he have been encysting?
couldn't we have been encysting?
couldn't you have been encysting?
couldn't they have been encysting?