I could throb you could throb he could throb we could throb you could throb they could throb
Forma con V-ing
I could be throbbing you could be throbbing he could be throbbing we could be throbbing you could be throbbing they could be throbbing
Perfecto
I could have throbbed you could have throbbed he could have throbbed we could have throbbed you could have throbbed they could have throbbed
Perfecto con V-ing
I could have been throbbing you could have been throbbing he could have been throbbing we could have been throbbing you could have been throbbing they could have been throbbing
Negación
Forma simple
I couldn't throb you couldn't throb he couldn't throb we couldn't throb you couldn't throb they couldn't throb
Forma con V-ing
I couldn't be throbbing you couldn't be throbbing he couldn't be throbbing we couldn't be throbbing you couldn't be throbbing they couldn't be throbbing
Perfecto
I couldn't have throbbed you couldn't have throbbed he couldn't have throbbed we couldn't have throbbed you couldn't have throbbed they couldn't have throbbed
Perfecto con V-ing
I couldn't have been throbbing you couldn't have been throbbing he couldn't have been throbbing we couldn't have been throbbing you couldn't have been throbbing they couldn't have been throbbing
Forma interrogativa
Forma simple
could I throb? could you throb? could he throb? could we throb? could you throb? could they throb?
Forma con V-ing
could I be throbbing? could you be throbbing? could he be throbbing? could we be throbbing? could you be throbbing? could they be throbbing?
Perfecto
could I have throbbed? could you have throbbed? could he have throbbed? could we have throbbed? could you have throbbed? could they have throbbed?
Perfecto con V-ing
could I have been throbbing? could you have been throbbing? could he have been throbbing? could we have been throbbing? could you have been throbbing? could they have been throbbing?
Forma interro-negativa
Forma simple
couldn't I throb? couldn't you throb? couldn't he throb? couldn't we throb? couldn't you throb? couldn't they throb?
Forma con V-ing
couldn't I be throbbing? couldn't you be throbbing? couldn't he be throbbing? couldn't we be throbbing? couldn't you be throbbing? couldn't they be throbbing?
Perfecto
couldn't I have throbbed? couldn't you have throbbed? couldn't he have throbbed? couldn't we have throbbed? couldn't you have throbbed? couldn't they have throbbed?
Perfecto con V-ing
couldn't I have been throbbing? couldn't you have been throbbing? couldn't he have been throbbing? couldn't we have been throbbing? couldn't you have been throbbing? couldn't they have been throbbing?