I could trip you could trip he could trip we could trip you could trip they could trip
Forma com V-ing
I could be tripping you could be tripping he could be tripping we could be tripping you could be tripping they could be tripping
Perfeito
I could have tripped you could have tripped he could have tripped we could have tripped you could have tripped they could have tripped
Perfeito com V-ing
I could have been tripping you could have been tripping he could have been tripping we could have been tripping you could have been tripping they could have been tripping
Negação
Forma simple
I couldn't trip you couldn't trip he couldn't trip we couldn't trip you couldn't trip they couldn't trip
Forma com V-ing
I couldn't be tripping you couldn't be tripping he couldn't be tripping we couldn't be tripping you couldn't be tripping they couldn't be tripping
Perfeito
I couldn't have tripped you couldn't have tripped he couldn't have tripped we couldn't have tripped you couldn't have tripped they couldn't have tripped
Perfeito com V-ing
I couldn't have been tripping you couldn't have been tripping he couldn't have been tripping we couldn't have been tripping you couldn't have been tripping they couldn't have been tripping
Forma interrogativa
Forma simple
could I trip? could you trip? could he trip? could we trip? could you trip? could they trip?
Forma com V-ing
could I be tripping? could you be tripping? could he be tripping? could we be tripping? could you be tripping? could they be tripping?
Perfeito
could I have tripped? could you have tripped? could he have tripped? could we have tripped? could you have tripped? could they have tripped?
Perfeito com V-ing
could I have been tripping? could you have been tripping? could he have been tripping? could we have been tripping? could you have been tripping? could they have been tripping?
Forma interro-Negação
Forma simple
couldn't I trip? couldn't you trip? couldn't he trip? couldn't we trip? couldn't you trip? couldn't they trip?
Forma com V-ing
couldn't I be tripping? couldn't you be tripping? couldn't he be tripping? couldn't we be tripping? couldn't you be tripping? couldn't they be tripping?
Perfeito
couldn't I have tripped? couldn't you have tripped? couldn't he have tripped? couldn't we have tripped? couldn't you have tripped? couldn't they have tripped?
Perfeito com V-ing
couldn't I have been tripping? couldn't you have been tripping? couldn't he have been tripping? couldn't we have been tripping? couldn't you have been tripping? couldn't they have been tripping?