could thirst
Regular verb: thirst - thirsted- thirsted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could thirst
you could thirst
she could thirst
we could thirst
you could thirst
they could thirst 	I could be thirsting
you could be thirsting
she could be thirsting
we could be thirsting
you could be thirsting
they could be thirsting	I could have thirsted
you could have thirsted
she could have thirsted
we could have thirsted
you could have thirsted
they could have thirsted	I could have been thirsting
you could have been thirsting
she could have been thirsting
we could have been thirsting
you could have been thirsting
they could have been thirsting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't thirst
you couldn't thirst
she couldn't thirst
we couldn't thirst
you couldn't thirst
they couldn't thirst 	I couldn't be thirsting
you couldn't be thirsting
she couldn't be thirsting
we couldn't be thirsting
you couldn't be thirsting
they couldn't be thirsting	I couldn't have thirsted
you couldn't have thirsted
she couldn't have thirsted
we couldn't have thirsted
you couldn't have thirsted
they couldn't have thirsted	I couldn't have been thirsting
you couldn't have been thirsting
she couldn't have been thirsting
we couldn't have been thirsting
you couldn't have been thirsting
they couldn't have been thirsting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I thirst?
could you thirst?
could she thirst?
could we thirst?
could you thirst?
could they thirst? 	could I be thirsting?
could you be thirsting?
could she be thirsting?
could we be thirsting?
could you be thirsting?
could they be thirsting? 	could I have thirsted?
could you have thirsted?
could she have thirsted?
could we have thirsted?
could you have thirsted?
could they have thirsted? 	could I have been thirsting?
could you have been thirsting?
could she have been thirsting?
could we have been thirsting?
could you have been thirsting?
could they have been thirsting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I thirst?
couldn't you thirst?
couldn't she thirst?
couldn't we thirst?
couldn't you thirst?
couldn't they thirst? 	couldn't I be thirsting?
couldn't you be thirsting?
couldn't she be thirsting?
couldn't we be thirsting?
couldn't you be thirsting?
couldn't they be thirsting? 	couldn't I have thirsted?
couldn't you have thirsted?
couldn't she have thirsted?
couldn't we have thirsted?
couldn't you have thirsted?
couldn't they have thirsted? 	couldn't I have been thirsting?
couldn't you have been thirsting?
couldn't she have been thirsting?
couldn't we have been thirsting?
couldn't you have been thirsting?
couldn't they have been thirsting?