could yearn
Regular verb: yearn - yearned- yearned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could yearn
you could yearn
he could yearn
we could yearn
you could yearn
they could yearn 	I could be yearning
you could be yearning
he could be yearning
we could be yearning
you could be yearning
they could be yearning	I could have yearned
you could have yearned
he could have yearned
we could have yearned
you could have yearned
they could have yearned	I could have been yearning
you could have been yearning
he could have been yearning
we could have been yearning
you could have been yearning
they could have been yearning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't yearn
you couldn't yearn
he couldn't yearn
we couldn't yearn
you couldn't yearn
they couldn't yearn 	I couldn't be yearning
you couldn't be yearning
he couldn't be yearning
we couldn't be yearning
you couldn't be yearning
they couldn't be yearning	I couldn't have yearned
you couldn't have yearned
he couldn't have yearned
we couldn't have yearned
you couldn't have yearned
they couldn't have yearned	I couldn't have been yearning
you couldn't have been yearning
he couldn't have been yearning
we couldn't have been yearning
you couldn't have been yearning
they couldn't have been yearning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I yearn?
could you yearn?
could he yearn?
could we yearn?
could you yearn?
could they yearn? 	could I be yearning?
could you be yearning?
could he be yearning?
could we be yearning?
could you be yearning?
could they be yearning? 	could I have yearned?
could you have yearned?
could he have yearned?
could we have yearned?
could you have yearned?
could they have yearned? 	could I have been yearning?
could you have been yearning?
could he have been yearning?
could we have been yearning?
could you have been yearning?
could they have been yearning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I yearn?
couldn't you yearn?
couldn't he yearn?
couldn't we yearn?
couldn't you yearn?
couldn't they yearn? 	couldn't I be yearning?
couldn't you be yearning?
couldn't he be yearning?
couldn't we be yearning?
couldn't you be yearning?
couldn't they be yearning? 	couldn't I have yearned?
couldn't you have yearned?
couldn't he have yearned?
couldn't we have yearned?
couldn't you have yearned?
couldn't they have yearned? 	couldn't I have been yearning?
couldn't you have been yearning?
couldn't he have been yearning?
couldn't we have been yearning?
couldn't you have been yearning?
couldn't they have been yearning?