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