I could stamp you could stamp she could stamp we could stamp you could stamp they could stamp
Forma con V-ing
I could be stamping you could be stamping she could be stamping we could be stamping you could be stamping they could be stamping
Perfecto
I could have stamped you could have stamped she could have stamped we could have stamped you could have stamped they could have stamped
Perfecto con V-ing
I could have been stamping you could have been stamping she could have been stamping we could have been stamping you could have been stamping they could have been stamping
Negación
Forma simple
I couldn't stamp you couldn't stamp she couldn't stamp we couldn't stamp you couldn't stamp they couldn't stamp
Forma con V-ing
I couldn't be stamping you couldn't be stamping she couldn't be stamping we couldn't be stamping you couldn't be stamping they couldn't be stamping
Perfecto
I couldn't have stamped you couldn't have stamped she couldn't have stamped we couldn't have stamped you couldn't have stamped they couldn't have stamped
Perfecto con V-ing
I couldn't have been stamping you couldn't have been stamping she couldn't have been stamping we couldn't have been stamping you couldn't have been stamping they couldn't have been stamping
Forma interrogativa
Forma simple
could I stamp? could you stamp? could she stamp? could we stamp? could you stamp? could they stamp?
Forma con V-ing
could I be stamping? could you be stamping? could she be stamping? could we be stamping? could you be stamping? could they be stamping?
Perfecto
could I have stamped? could you have stamped? could she have stamped? could we have stamped? could you have stamped? could they have stamped?
Perfecto con V-ing
could I have been stamping? could you have been stamping? could she have been stamping? could we have been stamping? could you have been stamping? could they have been stamping?
Forma interro-negativa
Forma simple
couldn't I stamp? couldn't you stamp? couldn't she stamp? couldn't we stamp? couldn't you stamp? couldn't they stamp?
Forma con V-ing
couldn't I be stamping? couldn't you be stamping? couldn't she be stamping? couldn't we be stamping? couldn't you be stamping? couldn't they be stamping?
Perfecto
couldn't I have stamped? couldn't you have stamped? couldn't she have stamped? couldn't we have stamped? couldn't you have stamped? couldn't they have stamped?
Perfecto con V-ing
couldn't I have been stamping? couldn't you have been stamping? couldn't she have been stamping? couldn't we have been stamping? couldn't you have been stamping? couldn't they have been stamping?