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