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