I could follow you could follow she could follow we could follow you could follow they could follow
Forma com V-ing
I could be following you could be following she could be following we could be following you could be following they could be following
Perfeito
I could have followed you could have followed she could have followed we could have followed you could have followed they could have followed
Perfeito com V-ing
I could have been following you could have been following she could have been following we could have been following you could have been following they could have been following
Negação
Forma simple
I couldn't follow you couldn't follow she couldn't follow we couldn't follow you couldn't follow they couldn't follow
Forma com V-ing
I couldn't be following you couldn't be following she couldn't be following we couldn't be following you couldn't be following they couldn't be following
Perfeito
I couldn't have followed you couldn't have followed she couldn't have followed we couldn't have followed you couldn't have followed they couldn't have followed
Perfeito com V-ing
I couldn't have been following you couldn't have been following she couldn't have been following we couldn't have been following you couldn't have been following they couldn't have been following
Forma interrogativa
Forma simple
could I follow? could you follow? could she follow? could we follow? could you follow? could they follow?
Forma com V-ing
could I be following? could you be following? could she be following? could we be following? could you be following? could they be following?
Perfeito
could I have followed? could you have followed? could she have followed? could we have followed? could you have followed? could they have followed?
Perfeito com V-ing
could I have been following? could you have been following? could she have been following? could we have been following? could you have been following? could they have been following?
Forma interro-Negação
Forma simple
couldn't I follow? couldn't you follow? couldn't she follow? couldn't we follow? couldn't you follow? couldn't they follow?
Forma com V-ing
couldn't I be following? couldn't you be following? couldn't she be following? couldn't we be following? couldn't you be following? couldn't they be following?
Perfeito
couldn't I have followed? couldn't you have followed? couldn't she have followed? couldn't we have followed? couldn't you have followed? couldn't they have followed?
Perfeito com V-ing
couldn't I have been following? couldn't you have been following? couldn't she have been following? couldn't we have been following? couldn't you have been following? couldn't they have been following?