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