could nictitate
Regular verb: nictitate - nictitated- nictitated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could nictitate
you could nictitate
he could nictitate
we could nictitate
you could nictitate
they could nictitate 	I could be nictitating
you could be nictitating
he could be nictitating
we could be nictitating
you could be nictitating
they could be nictitating	I could have nictitated
you could have nictitated
he could have nictitated
we could have nictitated
you could have nictitated
they could have nictitated	I could have been nictitating
you could have been nictitating
he could have been nictitating
we could have been nictitating
you could have been nictitating
they could have been nictitating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't nictitate
you couldn't nictitate
he couldn't nictitate
we couldn't nictitate
you couldn't nictitate
they couldn't nictitate 	I couldn't be nictitating
you couldn't be nictitating
he couldn't be nictitating
we couldn't be nictitating
you couldn't be nictitating
they couldn't be nictitating	I couldn't have nictitated
you couldn't have nictitated
he couldn't have nictitated
we couldn't have nictitated
you couldn't have nictitated
they couldn't have nictitated	I couldn't have been nictitating
you couldn't have been nictitating
he couldn't have been nictitating
we couldn't have been nictitating
you couldn't have been nictitating
they couldn't have been nictitating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I nictitate?
could you nictitate?
could he nictitate?
could we nictitate?
could you nictitate?
could they nictitate? 	could I be nictitating?
could you be nictitating?
could he be nictitating?
could we be nictitating?
could you be nictitating?
could they be nictitating? 	could I have nictitated?
could you have nictitated?
could he have nictitated?
could we have nictitated?
could you have nictitated?
could they have nictitated? 	could I have been nictitating?
could you have been nictitating?
could he have been nictitating?
could we have been nictitating?
could you have been nictitating?
could they have been nictitating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I nictitate?
couldn't you nictitate?
couldn't he nictitate?
couldn't we nictitate?
couldn't you nictitate?
couldn't they nictitate? 	couldn't I be nictitating?
couldn't you be nictitating?
couldn't he be nictitating?
couldn't we be nictitating?
couldn't you be nictitating?
couldn't they be nictitating? 	couldn't I have nictitated?
couldn't you have nictitated?
couldn't he have nictitated?
couldn't we have nictitated?
couldn't you have nictitated?
couldn't they have nictitated? 	couldn't I have been nictitating?
couldn't you have been nictitating?
couldn't he have been nictitating?
couldn't we have been nictitating?
couldn't you have been nictitating?
couldn't they have been nictitating?