I could yelp you could yelp she could yelp we could yelp you could yelp they could yelp
Forma con V-ing
I could be yelping you could be yelping she could be yelping we could be yelping you could be yelping they could be yelping
Perfecto
I could have yelped you could have yelped she could have yelped we could have yelped you could have yelped they could have yelped
Perfecto con V-ing
I could have been yelping you could have been yelping she could have been yelping we could have been yelping you could have been yelping they could have been yelping
Negación
Forma simple
I couldn't yelp you couldn't yelp she couldn't yelp we couldn't yelp you couldn't yelp they couldn't yelp
Forma con V-ing
I couldn't be yelping you couldn't be yelping she couldn't be yelping we couldn't be yelping you couldn't be yelping they couldn't be yelping
Perfecto
I couldn't have yelped you couldn't have yelped she couldn't have yelped we couldn't have yelped you couldn't have yelped they couldn't have yelped
Perfecto con V-ing
I couldn't have been yelping you couldn't have been yelping she couldn't have been yelping we couldn't have been yelping you couldn't have been yelping they couldn't have been yelping
Forma interrogativa
Forma simple
could I yelp? could you yelp? could she yelp? could we yelp? could you yelp? could they yelp?
Forma con V-ing
could I be yelping? could you be yelping? could she be yelping? could we be yelping? could you be yelping? could they be yelping?
Perfecto
could I have yelped? could you have yelped? could she have yelped? could we have yelped? could you have yelped? could they have yelped?
Perfecto con V-ing
could I have been yelping? could you have been yelping? could she have been yelping? could we have been yelping? could you have been yelping? could they have been yelping?
Forma interro-negativa
Forma simple
couldn't I yelp? couldn't you yelp? couldn't she yelp? couldn't we yelp? couldn't you yelp? couldn't they yelp?
Forma con V-ing
couldn't I be yelping? couldn't you be yelping? couldn't she be yelping? couldn't we be yelping? couldn't you be yelping? couldn't they be yelping?
Perfecto
couldn't I have yelped? couldn't you have yelped? couldn't she have yelped? couldn't we have yelped? couldn't you have yelped? couldn't they have yelped?
Perfecto con V-ing
couldn't I have been yelping? couldn't you have been yelping? couldn't she have been yelping? couldn't we have been yelping? couldn't you have been yelping? couldn't they have been yelping?